On the click of button back color of form will be changed in VB.NET(Three Button Red, green and blue,on the click of red button back color of form will be changed to red and so on.)

PROPERTIES:

Button1,Button2,Button3
Text(Button1)	RED
ForeColor(Button1)	red
Text(Button2)	GREEN
ForeColor(Button2)	green
Text(Button3)	BLUE
ForeColor(Button3)	blue
FlatStyle	Flat

CODEING:

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Me.BackColor = Color.Red
        Button1.BackColor = Color.DarkRed
    End Sub
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Me.BackColor = Color.Green
        Button2.BackColor = Color.LimeGreen
    End Sub
    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        Me.BackColor = Color.Blue
        Button3.BackColor = Color.Navy
    End Sub
End Class

DESIGNING: