求VB.net程序源代码 绘图板、二十一点游戏、计算器、井字棋游戏、屏幕保护程序等

说明：1.共有4个文本框其，其中三个是填入或输出数据的（名称分别是：txta txtb txtc），剩下的那个是符号(txtd)2.共7个按钮，4个是符号按钮，一个计算，一个清零．这是我弄的程序”袖珍计算器”代码也是自己编写的，代码如下：通用声明Dim j As Integer '定义j为整型

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Private Sub Text1_Change()End SubPrivate Sub Command1_Click()

txtfuhao.Text = "+" '将”＋”显示到文本框txtfuhao.Text中

End SubPrivate Sub Command2_Click()

txtfuhao.Text = "-" ''将”-”显示到文本框txtfuhao.Text中

End SubPrivate Sub Command3_Click()

txtfuhao.Text = "×" '将”×”显示到文本框txtfuhao.Text中

End SubPrivate Sub Command4_Click()

txtfuhao.Text = "÷" 将”÷”'显示到文本框txtfuhao.Text中

End Sub

Private Sub Command5_Click()

Dim a, b, c As Integer

a = Val(txta.Text) '将txta.Text里的内容转化为数值型,然后再赋给a

b = Val(txtb.Text) '将txtb.Text里的内容转化为数值型,然后再赋给b

If txtfuhao.Text = "+" Then '运算过程

c = a + b '运算过程

ElseIf txtfuhao.Text = "-" Then '运算过程

c = a - b '运算过程

ElseIf txtfuhao.Text = "÷" Then '运算过程

c = a / b '运算过程

ElseIf txtfuhao.Text = "×" Then '运算过程

c = a * b '运算过程

Else

j = MsgBox("您输入的符号不正确", vbOKOnly, "错误信息")

End If

txtc.Text = c '将运算结果c输出到文本框txtc中

End SubPrivate Sub Command6_Click()

txta.Text = "" '将空字符输入到文本框内（刷新）

txtb.Text = "" '将空字符输入到文本框内（刷新）

txtc.Text = "" '将空字符输入到文本框内（刷新）

txtfuhao.Text = "" '将空字符输入到文本框内（刷新）

End SubPrivate Sub Command7_Click()

End '结束程序

End SubPrivate Sub Form_Load()End Sub

VB.NET中的代码

大概的过程：

Imports System.Data

Imports System.Data.SqlClient

--------------

Dim a As New SqlDataAdapter

Dim con As SqlConnection

con = New SqlConnection( "Persist Security Info=False;Integrated Security=SSPI;database=northwind;server=.;Connect Timeout=30")

con.Open()

a.SelectCommand = New SqlCommand("select * from table where c=1", con)

a.UpdateCommand = New SqlCommand("update table set b=2 where c=1", con)

a.DeleteCommand = New SqlCommand("delete from table where c=1", con)

a.InsertCommand = New SqlCommand("insert into table values (1,2,3)", con)

a.SelectCommand.ExecuteNonQuery()

a.UpdateCommand.ExecuteNonQuery()

a.DeleteCommand.ExecuteNonQuery()

a.InsertCommand.ExecuteNonQuery()

con.Close()

a.Dispose()

急求以下vb.net代码

'我不会计时，因此下面代码中没有计时功能，要你自己去创建。

'Text1 As Label , Sui1 As Button , Sui2 As Button , Sui3 As Button , Fil1 As TextBox , Form1 As Form.

Public Class Form1

Private Sub Sui1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Sui1.Click

Dim i As Random = New Random

Dim iText As String = ""

For mn As Int16 = 1 To 30

Dim si As Int16 = i.Next(0, 25)

If si = 0 Then

iText += "a"

ElseIf si = 1 Then

iText += "b"

ElseIf si = 2 Then

iText += "c"

ElseIf si = 3 Then

iText += "d"

ElseIf si = 4 Then

iText += "e"

ElseIf si = 5 Then

iText += "f"

ElseIf si = 6 Then

iText += "g"

ElseIf si = 7 Then

iText += "h"

ElseIf si = 8 Then

iText += "i"

ElseIf si = 9 Then

iText += "j"

ElseIf si = 10 Then

iText += "k"

ElseIf si = 11 Then

iText += "l"

ElseIf si = 12 Then

iText += "m"

ElseIf si = 13 Then

iText += "n"

ElseIf si = 14 Then

iText += "o"

ElseIf si = 15 Then

iText += "p"

ElseIf si = 16 Then

iText += "q"

ElseIf si = 17 Then

iText += "r"

ElseIf si = 18 Then

iText += "s"

ElseIf si = 19 Then

iText += "t"

ElseIf si = 20 Then

iText += "u"

ElseIf si = 21 Then

iText += "v"

ElseIf si = 22 Then

iText += "w"

ElseIf si = 23 Then

iText += "x"

ElseIf si = 24 Then

iText += "y"

ElseIf si = 25 Then

iText += "z"

End If

Next

Text1.Text = iText

Sui1.Enabled = False

Sui2.Enabled = True

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Fil1.Enabled = False

Sui2.Enabled = False

Sui3.Enabled = False

End Sub

Private Sub Sui2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Sui2.Click

Fil1.Enabled = True

Sui3.Enabled = True

Fil1.Select()

End Sub

Private Sub Fil1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Fil1.TextChanged

If Fil1.Text.Count = Fil1.MaxLength Then

Fil1.Enabled = False

End If

End Sub

Private Sub Sui3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Sui3.Click

Fil1.Enabled = False

Sui2.Enabled = False

Sui1.Enabled = True

Sui3.Enabled = False

'完成结果。

MsgBox("suidu:" 30)

End Sub

End Class

跪求vb.net代码

新建窗口，添加picture控件

利用line()方法画线

line(开始x坐标,开始y坐标)-(结束x坐标,结束y坐标),线的颜色，画线的方式(默认为线，B为矩形无填充，BF为填充的矩形)

For i = 1 To 16

Picture1.Line (0, Picture1.Height / 2)-(i * (Picture1.Width / 16), 0), RGB(255, 0, 0)

Picture1.Line (0, Picture1.Height / 2)-(i * (Picture1.Width / 16), Picture1.Height), RGB(255, 0, 0)

Picture1.Line (Picture1.Width, Picture1.Height / 2)-(i * (Picture1.Width / 16), 0), RGB(0, 255, 0)

Picture1.Line (Picture1.Width, Picture1.Height / 2)-(i * (Picture1.Width / 16), Picture1.Height), RGB(0, 255, 0)

Next i

如果要在窗口上画也可以调用窗口的line方法即form.line()

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