C# - Semi Transparent Panel

This snippet shows how to develop a custom panel which is semi transparent by overriding CreateParams and the OnPaint method of the Panel control.

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xPanel

1. using System;  
2. using System.Drawing;  
3. using System.Drawing.Drawing2D;  
4. using System.Windows.Forms;  
5.  
6. class xPanel: Panel  
7. {  
8.     protected override CreateParams CreateParams  
9.     {  
10.          get  
11.          {  
12.               CreateParams cp = base.CreateParams;  
13.               cp.ExStyle |= 0x20;  
14.               return cp;  
15.          }  
16.     }  
17.  
18.     protected override void OnPaint(PaintEventArgs e)  
19.     {  
20.          e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(128, 0,0,0)), this.ClientRectangle);  
21.     }  
22.  
23.     protected override void OnSizeChanged(EventArgs e)  
24.     {  
25.          base.OnSizeChanged(e);  
26.     }  
27. }