ATMLCommonLibrary.controls.power.ACPowerSpecificationControl.edtPhase_KeyDown C# (CSharp) Method

        private void edtPhase_KeyDown(object sender, KeyEventArgs e)
        {
            //--- Suppress if a numeric key was not pressed ---//
            if (e.KeyCode < Keys.D0 && e.KeyCode > Keys.D9)
            {
                //--- Suppress if a numeric pad key was no pressed ---//
                if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
                {
                    //--- Suppress if the backspace was no pressed pressed ---//
                    if (e.KeyCode != Keys.Back)
                    {
                        // A non-numerical keystroke was pressed.
                        // Set the flag to true and evaluate in KeyPress event.
                        e.SuppressKeyPress = true;
                    }
                }
            }

            //--- Suppress if the shift key was being pressed as well ---//
            if (ModifierKeys == Keys.Shift)
            {
                e.SuppressKeyPress = true;
            }
        }