Question

I would like to make one numeric-only textbox. I’d like to then add that same to the control toolbox within Visual Studio 2008

I’ve already built the function to allow only numeric.

How can I make it available in the toolbox?

Answer 1

This is how you can create numeric TextBox:

public class NumericTextBox : TextBox
{
    protected override void OnKeyPress(KeyPressEventArgs e)
    {
        if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar))
        {
            e.Handled = true;
        }
        base.OnKeyPress(e);
    }
}