Restricting textbox input to numbers in C# [closed]

Answer 1

Have a look at the below code

private void txtbox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        const char Delete = (char)8;
        e.Handled = !Char.IsDigit(e.KeyChar) && e.KeyChar != Delete;
    }

This will be helpful but users can Copy and Paste characters :-)