FIX: KeyPad PLUS SIGN (+) and MINUS SIGN (-) Do Not Appear in DataGrid Control with C# (329333)

RESOLUTION

• OnKeyDown

public class OwnDataGrid : System.Windows.Forms.DataGrid
	{
		protected override void OnKeyDown(System.Windows.Forms.KeyEventArgs ke)
		{
			switch(ke.KeyCode)
			{
				case Keys.Add :
					ke = new KeyEventArgs(ke.Modifiers|Keys.Oemplus);
					break;
				case Keys.Subtract :
					ke = new KeyEventArgs(ke.Modifiers|Keys.OemMinus);
					break;
			}
			base.OnKeyDown(ke);
			base.ProcessGridKey(ke);
		}

		protected override bool ProcessDialogKey(System.Windows.Forms.Keys keyData)
		{
			switch(keyData)
			{																				  
				case Keys.Subtract :
					return base.ProcessDialogKey(Keys.OemMinus);

				case Keys.Add :
					return base.ProcessDialogKey(Keys.Oemplus);
				default :
					return base.ProcessDialogKey(keyData);
			}
		}
		

		protected override bool ProcessKeyPreview(ref System.Windows.Forms.Message m)
		{
			int WM_KEYDOWN = 0x100;
			if(m.Msg == WM_KEYDOWN) 
			{
				KeyEventArgs ke = new KeyEventArgs((Keys)m.WParam.ToInt32() | ModifierKeys);

				switch(ke.KeyCode)
				{
					case Keys.Add :
						ke = new KeyEventArgs(Keys.Oemplus | ModifierKeys);
						break;
					case Keys.Subtract :
						ke = new KeyEventArgs(Keys.OemMinus | ModifierKeys);
						break;
				}
				return base.ProcessGridKey(ke);
			}
			return base.ProcessKeyPreview(ref m);
		}
	}