'change textbox backcolour based on another textbox value

I'm trying to make TextBox3.Backcolor = TextBox2.BackColor using below code, however it fail.TextBox1 value is not fixed.Please help me

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

    TextBox1.Text = 3
    TextBox(TextBox1.Text).Backcolor = TextBox2.BackColor

End Sub

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'change textbox backcolour based on another textbox value

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