Ejemplo de combobox y list box (tablas de multiplicar )

Codigo:
Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim a As Integer
        For a = 1 To 12
            ComboBox1.Items.Add(a)
        Next
    End Sub


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

        Dim increment, resultado, numero1, nume As Integer
        ListBox1.Items.Clear()
        For numero1 = 0 To 11
            Select Case ComboBox1.Text
                Case numero1 + 1

                    nume = numero1 + 1
                    For increment = 1 To 10
                        resultado = nume * increment
                        ListBox1.Items.Add(nume & " x " & increment & "  =  " & resultado)

                    Next

            End Select

        Next


    End Sub

    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

    End Sub

    Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged

    End Sub

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

Menú script visual basic

Ejemplo:

Código de menús

Public Class FrmInicio

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        End

    End Sub

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

        Me.Hide()

        FrmAreas.Show()

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        Me.Hide()

        FrmAtri.Show()

    End Sub

    Private Sub TrianguloToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TrianguloToolStripMenuItem.Click

        Me.Hide()

        FrmAtri.Show()

    End Sub

    Private Sub CuadradoToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CuadradoToolStripMenuItem.Click

        Me.Hide()

        FrmAcuad.Show()

    End Sub

    Private Sub CirculoToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CirculoToolStripMenuItem.Click

        Me.Hide()

        FrmAcir.Show()

    End Sub

    Private Sub RectuanguloToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RectuanguloToolStripMenuItem.Click

        Me.Hide()

        Frmprec.Show()

    End Sub

    Private Sub TrianguloToolStripMenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TrianguloToolStripMenuItem1.Click

        Me.Hide()

        FrmPrec.Show()

    End Sub

    Private Sub CuadradoToolStripMenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CuadradoToolStripMenuItem1.Click

        Me.Hide()

        FrmPcuad.Show()

    End Sub

Public Class FrmAcir

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Double

        Dim pi As Double = 3.1416

        a = radio.Text

        a = a * a * pi

        resultado.Text = Trim(a)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        radio.Text = ""

        resultado.Text = ""

        radio.Focus()

    End Sub

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

    End Sub

End Class

Public Class FrmAcuad

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles numero1.TextChanged

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

      

        Dim area As Integer

        area = numero1.Text

        area = area * area

        resultado.Text = Trim(area)

    End Sub

    Private Sub Label3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label3.Click

    End Sub

    Private Sub numero2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        numero1.Text = ""

        resultado.Text = ""

        numero1.Focus()

    End Sub

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

    End Sub

End Class

Public Class FrmAreas

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click

        Me.Hide()

        FrmInicio.Show()

    End Sub

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

        Me.Hide()

        FrmAcuad.Show()

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        Me.Hide()

        FrmAtri.Show()

    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

        Me.Hide()

        FrmAcir.Show()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Me.Hide()

        FrmArec.Show()

    End Sub

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

    End Sub

End Class

Public Class FrmArec

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Integer

        Dim b As Integer

        Dim area As Integer

        a = base.Text

        b = altura.Text

        area = a * b

        resultado.Text = Trim(area)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        base.Text = ""

        altura.Text = ""

        resultado.Text = ""

        base.Focus()

    End Sub

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

    End Sub

End Class

Public Class FrmAtri

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

      Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Integer

        Dim b As Integer

        Dim area As Integer

        b = altura.Text

        a = base.Text

        area = a * b / 2

        resultado.Text = Trim(area)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        base.Text = ""

        altura.Text = ""

        resultado.Text = ""

        base.Focus()

    End Sub

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

    End Sub

End Class

Public Class FrmPcir

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles resultado.TextChanged

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Integer

        Dim perimetro As Integer

        a = radio.Text

        perimetro = 3.1416 * a * a

        resultado.Text = Trim(perimetro)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        radio.Text = ""

        resultado.Text = ""

        radio.Focus()

    End Sub

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

    End Sub

End Class

Public Class FrmPcuad

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Integer

        Dim area As Integer

        a = perimetro.Text

        area = a * 4

        resultado.Text = Trim(area)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        perimetro.Text = ""

        resultado.Text = ""

        perimetro.Focus()

    End Sub

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

    End Sub

End Class

Public Class FrmPerimetros

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click

        Me.Hide()

        FrmInicio.Show()

    End Sub

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

        Me.Hide()

        FrmPcuad.Show()

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        Me.Hide()

        FrmPtri.Show()

    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

        Me.Hide()

        FrmPcir.Show()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Me.Hide()

        Frmprec.Show()

    End Sub

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

    End Sub

End Class

Public Class Frmprec

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub TextBox3_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles numero2.TextChanged

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Integer

        Dim b As Integer

        Dim perimetro As Integer

        a = numero1.Text

        perimetro = a + a + a + a

        TextBox2.Text = Trim(perimetro)

    End Sub

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

    End Sub

End Class

Public Class FrmPtri

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

        Me.Hide()

        FrmInicio.Show()

    End Sub

    Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        Dim a As Integer

        Dim b As Integer

        Dim c As Integer

        Dim perimetro As Integer

        a = numero1.Text

        b = numero2.Text

        c = numero3.Text

        perimetro = a + b + c

        resultado.Text = Trim(perimetro)

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        numero1.Text = ""

        numero2.Text = ""

        numero3.Text = ""

        resultado.Text = ""

        numero1.Focus()

    End Sub

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

    End Sub

End Class

PANTALLAZOS: