Implementing message Filtering in C #

In C # We can filter our application's messages so some's them don ' t get dispatched. The example below of the "How to" prevent the user from clicking the left Mouse button in our application:

Created on 20.10.2001 at 18:04
This example has 2 classes
1. Myfilter, which exposes the Imesagefilter interface
The Prefiltermessage method is overriden to our needs
2. MainForm, which are our main form
Using System;
Using System.Windows.Forms;
Class Myfilter:imessagefilter//gets The left mouse button messages
{
public bool Prefiltermessage (ref message M)
{
if (m.msg>=513 && m.msg<=515)
{
Console.WriteLine ("Mouse left button event not accepted! Filter working ... ");
return (true);
}
return (false);
}
}
Class Mainform:form
{
Private button Btn=new button ();
Public mainform ()//mainform ' s constructor
{
Let's put a button on the form
Btn. left=30;
Btn. top=30;
Btn. width=150;
Btn. text= "Try to click me!";
Btn. Visible=true;
This. Controls.Add (BTN);
}
public static void Main ()
{

Let's put some filter on our application ' s message queue
Application.addmessagefilter (New Myfilter ());
Create the MainForm object and make it visible
Application.Run (New MainForm ());
}
}