Menghubungkan Database Ms.Acces

Imports System.Data
Imports System.Data.OleDb
Imports System.DBNull

Public Class Form1
    Inherits System.Windows.Forms.Form
    'Pendeklarasian objek
    Dim objConnection As OleDbConnection = New Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source= D:\Dea Prantika\Database\Database dan Data Binding\buku.mdb")
    Dim objDataAdapter As OleDbDataAdapter
    Dim objDataSet As DataSet
    Dim objDataView As DataView
    Dim WithEvents objCurrencyManager As CurrencyManager

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'KatalogDataSet.buku' table. You can move, or remove it, as needed.
        'Me.BukuTableAdapter.Fill(Me.KatalogDataSet.buku)FillDataSetAndView()
        FillDataSetAndView()
    End Sub

    Private Sub FillDataSetAndView()
        objDataView = Nothing 'membersihkan objek sebelum digunakan
        objDataSet = New DataSet() 'inisialisasi instance baru dari bjek data set
        objConnection.Open() 'membuka koneksi dataset
        objDataAdapter = New OleDbDataAdapter("select * from buku ORDER BY kd_buku", objConnection)
        objDataAdapter.Fill(objDataSet, ("buku"))
        objDataView = New DataView(objDataSet.Tables("buku"))
        objCurrencyManager = CType(Me.BindingContext(objDataView), CurrencyManager)
        objConnection.Close()

        DataGridView1.DataSource = objDataView
        DataGridView1.Refresh()
        tampil()
        objDataSet = Nothing
    End Sub

    Private Sub ShowPosition()
        txt_posisi.Text = objCurrencyManager.Position + 1 & "dari" & objCurrencyManager.Count()
    End Sub

    Private Sub btn_First_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_first.Click
        objCurrencyManager.Position = 0
        ShowPosition()
    End Sub

    Private Sub btn_previous_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_previous.Click
        objCurrencyManager.Position -= 1
        ShowPosition()
    End Sub

    Private Sub btn_next_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_next.Click
        objCurrencyManager.Position += 1
        ShowPosition()
    End Sub

    Private Sub btn_last_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_last.Click
        objCurrencyManager.Position = objCurrencyManager.Count()
        ShowPosition()
    End Sub

    Private Sub btn_save_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_add.Click
        Dim intPosition As Integer, intMaxID As Integer
        Dim strId As String
        Dim objCommand As OleDbCommand = New OleDbCommand()

        intPosition = objCurrencyManager.Position
        objDataSet = New DataSet()

        objConnection.Open()
        objDataAdapter = New OleDbDataAdapter("SELECT MAX(kd_buku) as MaxID from buku;", objConnection)
        objDataAdapter.Fill(objDataSet, "buku")

        'jika maxid kosong
        If objDataSet.Tables("buku").Rows(0).Item("MaxID") Is System.DBNull.Value Then
            intMaxID = 1000
        Else
            'strId = CStr(objDataSet.Tables("buku")).Rows(0).Item("MaxID")
            intMaxID += 1
        End If
        strId = "10" & intMaxID

        objCommand.Connection = objConnection
        objCommand.CommandText = "INSERT INTO buku (kd_buku, nm_buku, nm_pengarang, harga) values(?, ?, ?, ?,)"
        objCommand.CommandType = CommandType.Text

        'parameter untuk kolom kd_buku
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(0).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(0).DbType = DbType.String
        objCommand.Parameters.Item(0).Size = 4
        objCommand.Parameters.Item(0).Value = Txt_kd_buku.Text

        'parameter untuk kolom nm_buku
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(1).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(1).DbType = DbType.String
        objCommand.Parameters.Item(1).Size = 30
        objCommand.Parameters.Item(1).Value = Txt_nm_buku.Text

        'parameter untuk pengarang
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(2).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(2).DbType = DbType.String
        objCommand.Parameters.Item(2).Size = 20
        objCommand.Parameters.Item(2).Value = Txt_pengarang.Text

        'parameter untuk harga
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(3).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(3).DbType = DbType.Int64
        objCommand.Parameters.Item(3).Size = 8
        objCommand.Parameters.Item(3).Value = Txt_hrg.Text

        'eksekusi objek oledbcommand untuk memasukan data baru
        Try
            objCommand.ExecuteNonQuery()
        Catch err As OleDbException
            MessageBox.Show(err.Message)
        End Try

        objConnection.Close()

        'mengisi dataset dan binding kolom
        FillDataSetAndView()
        tampil()
        'BindFields()
        objCurrencyManager.Position = intPosition
        ShowPosition()
        'menampilkan pesan data telah ditambahkan
        ToolStripStatusLabel1.Text = "Data telah ditambahkan"
        'bersihkan
        objDataSet = Nothing
        objDataAdapter = Nothing
        objCommand = Nothing
    End Sub

    Private Sub btn_add_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_add.Click
        Txt_kd_buku.Text = ""
        Txt_nm_buku.Text = ""
        Txt_pengarang.Text = ""
        Txt_hrg.Text = ""
        Txt_cari.Text = ""
    End Sub

    Private Sub btn_update_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_update.Click
        Dim intPosition As Integer
        Dim objCommand As OleDbCommand = New OleDbCommand()
        'menyimpan posisi data saat ini
        intPosition = objCurrencyManager.Position
        'membuka koneksi database
        objConnection.Open()

        objCommand.Connection = objConnection
        objCommand.CommandText = "UPDATE buku Set nm_buku = ?, nm_pengarang = ?, harga = ?, WHERE kd_buku = ?"
        objCommand.CommandType = CommandType.Text

        'parameter untuk kolom nm_buku
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(0).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(0).DbType = DbType.String
        objCommand.Parameters.Item(0).Size = 30
        objCommand.Parameters.Item(0).Value = Txt_nm_buku.Text

        'parameter untuk kolom pngarang
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(1).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(1).DbType = DbType.String
        objCommand.Parameters.Item(1).Size = 20
        objCommand.Parameters.Item(1).Value = Txt_pengarang.Text

        'parameter untuk kolom harga
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(2).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(2).DbType = DbType.Currency
        objCommand.Parameters.Item(2).Size = 8
        objCommand.Parameters.Item(2).Value = Txt_hrg.Text

        'parameter untuk kolom kd_buku
        objCommand.Parameters.Add(New OleDbParameter())
        objCommand.Parameters.Item(3).Direction = ParameterDirection.Input
        objCommand.Parameters.Item(3).DbType = DbType.String
        objCommand.Parameters.Item(3).Size = 4
        objCommand.Parameters.Item(3).Value = Txt_kd_buku.Text

        objCommand.ExecuteNonQuery()
        objConnection.Close()
        FillDataSetAndView()
        tampil()
        'BindFields()
        objCurrencyManager.Position = intPosition
        ShowPosition()
        'menampilkan pesan data telah diganti
        ToolStripStatusLabel1.Text = "Data telah dganti"
        'bersihkan
        objCommand = Nothing
    End Sub

    Private Sub btn_sort_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_sort.Click
        Select Case cmb_field.SelectedIndex
            Case 0 'kd_buku
                objDataView.Sort = "kd_buku"
            Case 1 'nm_buku
                objDataView.Sort = "nm_buku"
            Case 2 'nm_pengarang
                objDataView.Sort = "nm_pengarang"
            Case 3 'harga
                objDataView.Sort = "harga"
        End Select
        btn_First_Click(Nothing, Nothing)
    End Sub

    Private Sub btn_cari_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Cari.Click
        Dim intPosition As Integer
        Select Case cmb_field.SelectedIndex
            Case 0 'kd_buku
                objDataView.Sort = "kd_buku"
            Case 1 'nm_buku
                objDataView.Sort = "nm_buku"
            Case 2 'nm_pengarang
                objDataView.Sort = "nm_pengarang"
            Case 3 'harga
                objDataView.Sort = "harga"
        End Select
        If cmb_field.SelectedIndex < 3 Then
            intPosition = objDataView.Find(Txt_cari.Text)
        Else
            intPosition = objDataView.Find(CDec(Txt_cari.Text))
        End If

        If intPosition = -1 Then
            ToolStripStatusLabel1.Text = "data tidak ditemukan"
        Else
            ToolStripStatusLabel1.Text = "data ditemukan"
            objCurrencyManager.Position = intPosition
        End If
        ShowPosition()
    End Sub

    Private Sub btn_delete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Delete.Click
        Dim intPosition As Integer
        Dim objcommand As OleDbCommand = New OleDbCommand()
        intPosition = Me.BindingContext(objDataView).Position - 1

        'jika posisi <0 set ke 0
        If intPosition < 0 Then
            intPosition = 0
        End If

        objConnection.Open()
        objcommand.Connection = objConnection
        objcommand.CommandText = "DELETE FROM buku WHERE kd_buku = ?;"
        objcommand.CommandType = CommandType.Text
        'menambahkan parameter
        'parameter untuk kolom kd_buku
        objcommand.Parameters.Add(New OleDbParameter())
        objcommand.Parameters.Item(0).Direction = ParameterDirection.Input
        objcommand.Parameters.Item(0).DbType = DbType.String
        objcommand.Parameters.Item(0).Size = 4
        objcommand.Parameters.Item(0).Value = Txt_kd_buku.Text

        'eksekusi untuk update data
        objcommand.ExecuteNonQuery()

        objConnection.Close()
        FillDataSetAndView()
        tampil()
        Me.BindingContext(objDataView).Position = intPosition
        ShowPosition()
        objcommand = Nothing
    End Sub

    Private Sub tampil()
        Me.Txt_kd_buku.Text = objDataView.Item(objCurrencyManager.Position).Item("kd_buku")
        Me.Txt_pengarang.Text = objDataView.Item(objCurrencyManager.Position).Item("nm_pengarang")
        Me.Txt_nm_buku.Text = objDataView.Item(objCurrencyManager.Position).Item("nm_buku")
        Me.Txt_hrg.Text = objDataView.Item(objCurrencyManager.Position).Item("harga")
    End Sub

    Private Sub objCurrencyManager_PositionChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles objCurrencyManager.PositionChanged
        ShowPosition()
        tampil()
    End Sub

    Private Sub btn_exit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_exit.Click
        End
    End Sub
End Class

Pembuatan Program Kode Database

Hallo selamat siang semua.. ketemu saya lagi nih disini hehehe kali ini saya akan membahas mengenai database dan data bindings dalam visual basic (dot) net.Ini adalah materi VB(dot)Net latihan saya di kampus.Sebenarnya cukup sulit untuk menyatukannya antara form data set, data adapter, data source, dan data connection.Saya rasa semua sudah bisa dasarnya dalam pembuatan form-form, makan saya tidak akan menjelaskan lagi.Okeyy langsung saja mari kita simak codingan berikut ini dengan teliti dan cermat..

Public Class Form1
    Dim WithEvents objcurr As CurrencyManager
    Dim objDateView As DataView

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'BukuDataSet.Buku' table. You can move, or remove it, as needed.
        Me.BukuTableAdapter.Fill(Me.BukuDataSet.Buku)
        'Me.OleDbDataAdapter1.Fill(Me.BukuDataSet.Buku)
        objDateView = New DataView(BukuDataSet.Tables("buku"))
        objcurr = CType(Me.BindingContext(objDateView), CurrencyManager)
        DataGridView1.DataSource = objDateView
        DataGridView1.Refresh()
    End Sub

    Private Sub btnsave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnsave.Click
        BukuDataSet.Buku.AddBukuRow(txt_kd_buku.Text, txtnmbk.Text, txtpngrng.Text, txthrg.Text)
        OleDbDataAdapter1.Update(BukuDataSet.Buku)
        objDateView = New DataView(BukuDataSet.Tables("buku"))
        objcurr = CType(Me.BindingContext(objDateView), CurrencyManager)
        DataGridView1.DataSource = objDateView
        DataGridView1.Refresh()

        Btnupdate.Enabled = True
        Btnadd.Enabled = True
        Btnsave.Enabled = False
    End Sub

    Private Sub btnexit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_exit.Click
        End
    End Sub

    Private Sub btnadd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnadd.Click
        bersihkan()
        txt_kd_buku.Text = ""
        txtnmbk.Text = ""
        txtpngrng.Text = ""
        txthrg.Text = ""

        Btnsave.Enabled = True
        Btnadd.Enabled = False
        Btnupdate.Enabled = False
    End Sub

    Private Sub btnupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnupdate.Click
        Dim pos As Integer

        bersihkan()
        BukuDataSet.Buku(Me.BindingContext(BukuDataSet, "buku").Position).EndEdit()
        'Me.BukuDataSet.Buku.FindBykd_buku(Me.txt_kd_buku.Text).nm_buku = Me.txtnmbk.Text
        'Me.BukuDataSet.Buku.FindBykd_buku(Me.txt_kd_buku.Text).nm_pengarang = Me.txtpngrng.Text
        'Me.BukuDataSet.Buku.FindBykd_buku(Me.txt_kd_buku.Text).harga = Me.txthrg.Text
        OleDbDataAdapter1.Update(BukuDataSet.Buku)
        objcurr.Position = pos
        OleDbConnection1 = Nothing
        Btnadd.Enabled = True
    End Sub

    Private Sub btndelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
        'Me.BukuDataSet.Buku.FindBykd_buku(Me.txt_kd_buku.Text).Delete()
        OleDbDataAdapter1.Update(BukuDataSet.Buku)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        objcurr.Position += 1
    End Sub

    Private Sub tampil()
        Me.txt_kd_buku.Text = New DataView(BukuDataSet.Tables("buku")).Item(objcurr.Position).Item("kd_buku")
        Me.Txtpngrng.Text = New DataView(BukuDataSet.Tables("buku")).Item(objcurr.Position).Item("nm_pengarang")
        Me.Txtnmbk.Text = New DataView(BukuDataSet.Tables("buku")).Item(objcurr.Position).Item("nm_buku")
        Me.Txthrg.Text = New DataView(BukuDataSet.Tables("buku")).Item(objcurr.Position).Item("harga")
    End Sub

    Private Sub objCurrencyManager_PositionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles objcurr.PositionChanged
        tampil()
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        objcurr.Position -= 0
    End Sub


    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        objcurr.Position -= 1
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        objcurr.Position = objcurr.Count()
    End Sub

    Private Sub bersihkan()
        txt_kd_buku.DataBindings.Clear()
        txtnmbk.DataBindings.Clear()
        txtpngrng.DataBindings.Clear()
        txthrg.DataBindings.Clear()
    End Sub

End Class

Bisa dilihat diatas, itu contoh membuat database pada toko buku.Saya merancangnya dengan sedikit panduan dari modul dosen kampus saya.Untuk lebih jelasnya bisa kalian coba dirumah atau di kampus dengan VB sendiri.Sekiranya cukup jelas sampai disini, kurang lebihnya mohon maaf.Selamat membaca, semoga dapat menambah ilmu anda.Salam mahasiswa!! :)

Follow me: @deaprantika ;)

Membuat Kalkulator Riil VB(dot)Net

Disini saya ingin berbagi ilmu mengenai kalkulator riil atau kalkulator yang sangat efektif dalam Virtual Basic atau disebut VB.Net.Tetapi disini saya belum menambahkan cos sin atau tan.Hanya cuma plus minum bagi dan kali saja.Mungkin di lain waktu akan saya share lagi kalkulator yang lebih lengkap dan banyak sehingga namanya bukan kalkulator riil lagi tetapi kalkulator sangat riil.Kalian pasti sudah tau cara membuat form-form nya.Saya hanya sekedar memberi ilmu dalam nya saja atau codingannya.
Okeyyy langsung saja codingan yang pertama untuk tombol 1 sampai 0.

Public Class Form1 (Untuk membuat Form Button 1 sampai 0)

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 1
        Else
            TextBox1.Text = TextBox1.Text & 1
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 2
        Else
            TextBox1.Text = TextBox1.Text & 2
        End If
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 3
        Else
            TextBox1.Text = TextBox1.Text & 3
        End If
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 4
        Else
            TextBox1.Text = TextBox1.Text & 4
        End If
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 5
        Else
            TextBox1.Text = TextBox1.Text & 5
        End If
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 6
        Else
            TextBox1.Text = TextBox1.Text & 6
        End If
    End Sub

    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 7
        Else
            TextBox1.Text = TextBox1.Text & 7
        End If
    End Sub

    Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 8
        Else
            TextBox1.Text = TextBox1.Text & 8
        End If
    End Sub

    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 9
        Else
            TextBox1.Text = TextBox1.Text & 9
        End If
    End Sub

    Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
        If TextBox1.Text = 0 Then
            TextBox1.Text = 0
        Else
            TextBox1.Text = TextBox1.Text & 0
        End If
    End Sub
End Class
















Ini untuk menentukan operasi tambah, kurang, kali, dan bagi.Perhatikan simbolnya saja "..."
       
Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click
        Angka2 = TextBox1.Text
        If simbol = "+" Then
            hasil = Angka1 + Angka2
        ElseIf simbol = "-" Then
            hasil = Angka1 - Angka2
        ElseIf simbol = "*" Then
            hasil = Angka1 * Angka2
        ElseIf simbol = "/" Then
            hasil = Angka1 / Angka2
        End If
        TextBox1.Text = hasil
    End Sub
  
  
    Lalu selanjutnya ini untuk codingan button tombol sama dengan ( = )
    TextBox1.Text = 0

Cukup sekian sampai disini, kurang lebihnya mohon maaf dan semoga berguna untuk belajar yah.Salam mahasiswa!! :)

Dont forget guys.. ;)
Follow me on twitter: @deaprantika @nogatasbrig

Cara Membuat Kalkulator Visual Basic

Hanya sekedar share ilmu aja tentang VB(dot)net.Disini saya akan memberikan rumus dan codingan untuk membuat kalkulator dalam VB.Net.Ini adalah sebagian materi kuliah saya juga workshop maupun kursus.Cukup simple dan tidak bertele-tel, okeyyy saya akan langsung jabarkan dibawah ini.Mari disimak..

Ini dia contoh codingan dasar membuat kalkulator.
Imports WindowsApplication1.Coba.Kalkulator
Public Class Form1
    Dim c As New Coba.Kalkulator

    Private Sub btnTambah_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTambah.Click
        Me.LblOperator.Text = Me.btnTambah.Text
        Me.TxtHasil.Text = c.Add(Val(Me.TxtAngka1.Text), Val(Me.TxtAngka2.Text))
    End Sub
    Private Sub BtnKali_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnKali.Click
        Me.LblOperator.Text = Me.btnKali.Text
        Me.TxtHasil.Text = c.Mult(Val(Me.TxtAngka1.Text), Val(Me.TxtAngka2.Text))
    End Sub
    Private Sub BtnBagi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBagi.Click
        Me.LblOperator.Text = Me.btnBagi.Text
        Me.TxtHasil.Text = c.Divide(Val(Me.TxtAngka1.Text), Val(Me.TxtAngka2.Text))
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Me.TxtAngka1.Text = ""
        Me.TxtAngka2.Text = ""
        Me.TxtHasil.Text = ""
        Me.LblOperator.Text = ""
        Me.TxtAngka1.Focus()
    End Sub
    Private Sub BtnKurang_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnKurang.Click
        Me.LblOperator.Text = Me.btnKurang.Text
        Me.TxtHasil.Text = c.Less(Val(Me.TxtAngka1.Text), Val(Me.TxtAngka2.Text))
    End Sub
End Class

Setelah membuat codingan dasarnya, disini kita akan menentukan codingan untuk rumus dibagi, ditambah, dikali, dan dikurang.Disimak baik-baik yah kawan :)
Namespace Coba
    Public Class Kalkulator
        Public Function Add(ByVal a As Integer, ByVal b As Integer) As Integer
            Add = a + b
        End Function
        Public Function Mult(ByVal a As Integer, ByVal b As Integer) As Integer
            Mult = a * b
        End Function
        Public Function Divide(ByVal a As Byte, ByVal b As Byte) As Decimal
            Divide = a / b
        End Function
        Public Function Less(ByVal a As Integer, ByVal b As Integer) As Integer
            Less = a - b
        End Function

    End Class
End Namespace

Selamat mencoba untuk belajar menggunakan kalkulator.Semoga bermanfaat untuk kalian yang ingin belajar nya secara pelan-pelan dan mendasar.

Follow me on Twitter: @deaprantika @nogatasbrig

Contoh Program VB.Net

Codingan 1
Create directory
Imports System.IO
Module Module1
Sub Main()
Console.WriteLine("Creating directories...")
Directory.CreateDirectory("D:\test01")
Directory.CreateDirectory("D:\Temp\Sample02")
Directory.CreateDirectory("Sample03")
Console.WriteLine("Directories created")
End Sub
End Module


Codingan 2

Imports System.IO
Module Module1
Sub Main()
Try
Directory.Delete("C:\Sample01", True)
Catch E As Exception
Console.WriteLine("Error deleting directory C:\Sample01")
Console.WriteLine("Error (0)", E.Message)
End Try
End Sub
End Module


Codingan 3

Imports System.IO
Module Module1
Sub Main()
Try
If (Directory.Exists("D:\test01")) Then
Console.WriteLine("D:\test01 already exists")
Else
Directory.CreateDirectory("C:\test01")
End If
Console.WriteLine("Directories created")
Catch E As Exception
Console.WriteLine("Error creating directory")
Console.WriteLine("Error: (0)", E.Message)
End Try
End Sub
End Module 


Codingan 4

Imports System.IO
Module Module1
Sub Main()
Dim Root As New DirectoryInfo("C:\")
Dim Files As FileInfo() = Root.GetFiles("*.*")
Dim Dirs As DirectoryInfo() = Root.GetDirectories("*.*")
Console.WriteLine("Root Files")
Dim Filename As FileInfo
For Each Filename In Files
Try
Console.Write(Filename.FullName)
Console.Write(" Size: (0) bytes", Filename.Length)
Console.WriteLine(" Last use: (0)", Filename.LastAccessTime)
Catch E As Exception
Console.WriteLine("Error accessing File")
End Try
Next
End Sub
End Module 


Codingan 5
 
Contoh Unconditional Branching

Option Strict On
Imports System
Module Module1
Sub Main()
Console.WriteLine("Ini method utamanya,,") SomeMethod()
Console.WriteLine("Kembali ke method utama...")
Console.ReadLine()
End Sub
Sub SomeMethod()
Console.WriteLine("Sekarang tampil deh method percabangannya!!")
End Sub
End Module

 
Codingan 6
 
Contoh If Statement

Module Module1
Sub Main()
Dim nilai1 As Integer = 10
Dim nilai2 As Integer = 20
Dim maxValue As Integer

maxValue = Cint(IIf((nilai1 > nilai2), nilai1, nilai2))

Console.WriteLine("Nilai pertama: (0), Nilai kedua (1),
maxValue: (2)", nilai1, nilai2, maxValue)
Console.ReadLine()
End Sub
End Module 


Codingan 7

Module Module1
Dim kal As String
Dim a() As Char
Dim x, i, k As Integer
Dim hrf(20) As Char
Dim bnyk(20) As Byte
Sub Main()
Dim m As Byte
Console.Write("masukan kalimat : ")
kal = Console.ReadLine
x = kal.Length()
ReDim a(x + 1)
For i = 0 To x
a(i) = Mid(kal, i + 1, 1)
Console.Write(a(i))
Next i
urut(a)
Console.WriteLine("data yang telah urut")
For i = 0 To x
Console.WriteLine(a(i))
Next
Console.WriteLine()
Console.WriteLine()
HitungKata(a)
For i = 0 To k - 1
If (hrf(i) = " ") Then
Console.WriteLine("spasi banyaknya = (0)", bnyk(i))
Else
Console.WriteLine("huruf (0) banyaknya = (1)", hrf(i), bnyk(i))
End If
Next
Console.ReadLine()
End Sub
Sub urut(ByRef a() As Char)
Dim i, j As Byte
Dim temp As Char
Console.WriteLine("banyak huruf : (0)", x)
For i = 0 To x
For j = i + 1 To x
If (a(i) > a(j)) Then
temp = a(j)
a(j) = a(i)
a(i) = temp
End If
Next
Next
End Sub
Sub HitungKata(ByVal a() As Char)
i = 1
Dim m As Byte
k = 0
m = 0
While (i < x + 1)
bnyk(k) = 1
hrf(k) = a(i)
While (a(i) = a(i + 1))
bnyk(k) += 1
i += 1
End While
k += 1
i += 1
End While

End Sub

End Module 



Codingan 8

Imports System
Imports System.Collections
Imports System.Collections.Generic
Imports System.Collections.Specialized

Public Class MainClass

Shared Sub Main(ByVal args As String())
Dim dict As New StudentListDictionary
dict.Add("111-11-1111", New Student("A", "A"))
dict.Add("333-22-3333", New Student("B", "B"))
dict.Add("444-44-4444", New Student("C", "C"))
dict.Add("555-55-5555", New Student("D", "D"))

Dim student As Student = dict.Item("111-11-1111")
Console.WriteLine(student.ToString)
Console.ReadLine()

End Sub
End Class

Public Class Student
Private m_FirstName As String
Private m_LastName As String
Public Sub New(ByVal first_name As String, ByVal last_name As String)
m_FirstName = first_name
m_LastName = last_name
End Sub
Public Overrides Function ToString() As String
Return m_FirstName & " " & m_LastName
End Function
End Class

Public Class StudentListDictionary
Inherits ListDictionary

'Add a Dictionary entry.
Public Shadows Sub Add(ByVal new_key As String, ByVal new_student As Student)
MyBase.Add(new_key, new_student)
End Sub

'Return an object with the given key.
Default Public Shadows Property Item(ByVal key As String) As Student
Get
Return DirectCast(MyBase.Item(key), Student)
End Get
Set(ByVal Value As Student)
MyBase.Item(key) = Value
End Set
End Property
'Return True if the Dictionary contains this Student.
Public Shadows Function Contain(ByVal key As String) As Boolean
Return MyBase.Contains(key)
End Function
'Remove this entry.
Public Shadows Sub Remove(ByVal key As String)
MyBase.Remove(key)
End Sub
End Class