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Calculate area of particular shape in VB.NET.

PROPERTIES:
RadioButton1
TextSquare
RadioButton2
TextRectangle
RadioButton3
TextTriangle
Textbox1,Textbox2,Label1,Label2
Text(Empty)
Label3
TextSelect Any Shape
Button1
TextOK
CODEING:
Public Class Form1
    Private Sub RadioButton1_CheckedChanged(sender As Object, e As EventArgs) Handles RadioButton1.CheckedChanged, RadioButton2.CheckedChanged, RadioButton3.CheckedChanged
        If RadioButton1.Checked Then
            Label1.Text = "Side"
            TextBox1.Visible = True
            TextBox2.Visible = False
            Label2.Text = ""
        ElseIf RadioButton2.Checked Then
            Label1.Text = "Length"
            TextBox1.Visible = True
            Label2.Text = "Width"
            TextBox2.Visible = True
        Else
            Label1.Text = "Base"
            TextBox1.Visible = True
            Label2.Text = "Height"
            TextBox2.Visible = True
        End If
        TextBox1.Clear()
        TextBox2.Clear()
        Label3.Text = "Enter Number in Box"
    End Sub
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If RadioButton1.Checked Then
            Label3.Text = "Area of Square is :" & Val(TextBox1.Text) ^ 2
        ElseIf RadioButton2.Checked Then
            Label3.Text = "Area of Rectangle is :" & Val(TextBox1.Text) * Val(TextBox2.Text)
        ElseIf RadioButton3.Checked Then
            Label3.Text = "Area of Triangle is :" & Val(TextBox1.Text) * Val(TextBox2.Text) / 2
        End If
    End Sub
End Class
DESIGNING:

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