Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim id As Integer
        If RadioButton1.Checked = True Then id = 1
        If RadioButton2.Checked = True Then id = 2
        If RadioButton3.Checked = True Then id = 3
        TextBox1.Text = Choose(id, "國文", "英文", "數學")
    End Sub
End Class

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ListBox1.Items.Add(ComboBox1.SelectedItem)
    End Sub
End Class

範例2 點餐系統

Public Class Form1
    Dim s As Integer
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        s = 0
        If RadioButton1.Checked = True Then
            s = s + 200
        End If
        If RadioButton2.Checked = True Then
            s = s + 150
        End If
        If RadioButton3.Checked = True Then
            s = s + 100
        End If
        If CheckBox1.Checked = True Then
            s = s + 50
        End If
        If CheckBox2.Checked = True Then
            s = s + 30
        End If
        If CheckBox3.Checked = True Then
            s = s + 100
        End If
        If CheckBox4.Checked = True Then
            s = s + 40
        End If
        TextBox1.Text = s
    End Sub
End Class

範例3 顯示圖片

Public Class Form1
    Dim gp As Graphics  '宣告桌布
    Dim img As Image    '宣告圖檔
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click  '按鈕按下時
        gp.DrawImage(img, 0, 0, img.Width, img.Height)  '將圖檔顯示在桌布
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load  '畫面載入時
        gp = PictureBox1.CreateGraphics      '產生桌布
        img = Image.FromFile("c:\test.jpg")  '指定圖檔位置
    End Sub
End Class

Public Class Form1
    Dim gp As Graphics  '宣告桌布
    Dim img As Image    '宣告圖檔
    Dim img1 As Image
    Dim s As Integer
  

範例4 動態切換圖片 

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load  '畫面載入時
        gp = PictureBox1.CreateGraphics      '產生桌布
        img = Image.FromFile("c:\test.jpg")  '指定圖檔位置
        img1 = Image.FromFile("c:\test1.jpg")  '指定圖檔位置
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        If s = 0 Then
            gp.DrawImage(img, 0, 0, img.Width, img.Height)  '將圖檔顯示在桌布
            s = 1
        else
            gp.DrawImage(img1, 0, 0, img.Width, img.Height)  '將圖檔顯示在桌布
            s = 0
        End If
    End Sub
End Class

範例五

Imports System.Drawing   '匯入繪圖元件
Public Class Form1
    Dim gp As Graphics  '宣告繪圖物件
    Dim pn As Pen       '宣告畫筆
    Dim w, h As Integer
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        w = 40   '設定長方形長寬
        h = 20
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        w = 20   '設定正方形長寬
        h = 20
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        gp.Clear(Color.White)   '清除為白色
    End Sub

    Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
        gp.DrawRectangle(pn, e.X, e.Y, w, h)  '繪圖在畫筆的座標
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        gp = PictureBox1.CreateGraphics   '建立繪圖物件
    End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        pn = New Pen(Color.Blue, 1)      '宣告畫筆藍色
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        pn = New Pen(Color.Red, 1)      '宣告畫筆紅色
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        pn = New Pen(Color.Green, 1)   '宣告畫筆綠色
    End Sub
End Class

---------------------------------亂數繪圖-------------------------

Imports System.Drawing  '匯入系統變數
Public Class Form1

    Dim Gp As Graphics   '定義繪圖物件
    Dim pn As Pen        '定義畫筆
    Dim x, y, w, h As Integer  '設定XY軸位置及WH寬高
    Dim r, g, b As Integer     '設定RGB三原色

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Randomize()       '產生亂數
        For i = 1 To 100   '產生100個迴圈
            x = Int(Rnd() * 600)   '產生亂數
            y = Int(Rnd() * 400)
            w = Int(Rnd() * 100)
            h = Int(Rnd() * 100)
            r = Int(Rnd() * 256)
            g = Int(Rnd() * 256)
            b = Int(Rnd() * 256)
            pn = New Pen(Color.FromArgb(r, g, b))  '設定畫筆顏色
            Gp.DrawEllipse(pn, x, y, w, h)         '畫橢圓
        Next i
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Gp = PictureBox1.CreateGraphics    '設定物件
    End Sub
End Class

------拉霸程式------------------------

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Timer1.Enabled = False
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Randomize()
        Label1.Text = Int(Rnd() * 10)
        Label2.Text = Int(Rnd() * 10)
        Label3.Text = Int(Rnd() * 10)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Timer1.Enabled = True
    End Sub
End Class