.NET (Core and Framework)

<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Drawing;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
<br />
namespace ComboTest<br />
{<br />
	class ComboDraw : ComboBox<br />
	{<br />
		public ComboDraw()<br />
		{<br />
			DrawMode = DrawMode.OwnerDrawFixed;<br />
			DropDownStyle = ComboBoxStyle.DropDown;<br />
			FlatStyle = FlatStyle.Flat;<br />
			SetStyle(ControlStyles.UserPaint, true);<br />
		}<br />
<br />
		protected override void OnPaint(PaintEventArgs e)<br />
		{<br />
			base.OnPaint(e);<br />
<br />
			e.Graphics.FillRectangle(new SolidBrush(Color.Green), ClientRectangle);<br />
		}<br />
	}<br />
}<br />

try
{
    // the thing you want to do
}
catch (Exception ex)
{
    // the code to run if an exception is raised
}

try
{
    // the thing you want to do
}
catch (ArgumentException ex)
{
    // the code to run if a bad parameter has passed
}
catch (IOException ex)
{
    // the code to run if an IO exception occurs
}

<br />
catch (BadIntegerException)<br />
{<br />
  //do stuff<br />
}<br />
catch (BadDataException)<br />
{<br />
  //do other stuff<br />
}<br />

<br />
catch (BadDataException)<br />
{<br />
  //do stuff<br />
}<br />
catch (BadIntegerException)<br />
{<br />
  //do other stuff<br />
}<br />

Rob Philpott wrote:

but its a rubbish idea and I wish I'd never said anything now.