Vısual Studio 2005 İle Hesap Makinası Yapma

Public Class Form1
    Dim a As Integer
    Dim b As String


    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        a = TextBox1.Text
        b = "topla"
        TextBox1.Text = ""



    End Sub

    Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
        a = TextBox1.Text
        b = "çıkart"
        TextBox1.Text = ""

    End Sub

    Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click
        a = TextBox1.Text
        b = "çarp"
        TextBox1.Text = ""

    End Sub

    Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click
        a = TextBox1.Text
        b = "böl"
        TextBox1.Text = ""

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        TextBox1.Text = TextBox1.Text & "1"

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        TextBox1.Text = TextBox1.Text & "2"


    End Sub

    Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
        TextBox1.Text = " "
        TextBox1.Text = " "

    End Sub

    Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
        If b = "topla" Then
            TextBox1.Text = a + TextBox1.Text
        ElseIf b = "çarp" Then
            TextBox1.Text = a * TextBox1.Text
        ElseIf b = "çıkart" Then
            TextBox1.Text = a - TextBox1.Text
        ElseIf b = "böl" Then
            TextBox1.Text = a / TextBox1.Text
        ElseIf b = "yüzde" Then
            TextBox1.Text = a * TextBox1.Text / 100
        ElseIf TextBox1.Text = "" Then
            MsgBox("lütfen rakam giriniz")
        End If

    End Sub

    Private Sub Button17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.Click
        Close()
    End Sub

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

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        TextBox1.Text = TextBox1.Text & "4"
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        TextBox1.Text = TextBox1.Text & "5"
    End Sub

    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        TextBox1.Text = TextBox1.Text & "6"
    End Sub

    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        TextBox1.Text = TextBox1.Text & "7"
    End Sub

    Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click
        TextBox1.Text = TextBox1.Text & "8"
    End Sub

    Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
        TextBox1.Text = TextBox1.Text & "9"
    End Sub

    Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click
        TextBox1.Text = TextBox1.Text & "0"
    End Sub

    Private Sub Button17_MouseLeave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.MouseLeave
        BackColor = Color.Gold


    End Sub

    Private Sub Button17_MouseMove(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Button17.MouseMove
        BackColor = Color.Red
    End Sub

    Private Sub Button4_MouseUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Button4.MouseUp
        BackColor = Color.Gold

    End Sub

    Private Sub Form1_MouseHover(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.MouseHover


    End Sub

    Private Sub Button18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button18.Click
        a = TextBox1.Text
        b = "yüzde"
        TextBox1.Text = ""
    End Sub
End Class