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How can I change the Background Color of a TextBox programmatically in Visual Basic

    Question

  • I have a TextBox that I would like to change the Background color to a different color than on the designer. Could you show me the code that could handle this?  I want to just change the text in the TextBox and automatically change the Background color when the text is changed.  Thank you.

     
    Tuesday, June 07, 2016 2:50 AM

Answers

  • Handle the TextChanged even, and assign the colour to BackColor property. For example, if your textbox is called TextBox1, and you want to apply a green background when the text contains more than three characters, then paste this fragment to your code; (press <F7> if you are in Form Designer):

    Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
    
        If TextBox1.TextLength > 3 Then
            TextBox1.BackColor = Color.Green
        Else
            TextBox1.BackColor = SystemColors.Window
        End If
    
    End Sub




    Tuesday, June 07, 2016 4:46 AM