pointcuts of any system inbuilt .exe methods

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C#3.0

C#

Actually I am java developer where I am using AOP pointcut for some system methods to generate customized method with same signature.
i.e

pointcut ps(String s,int i1,int i2)  : call (void java.awt.Graphics.drawString(String,int,int)) && args(s,i1,i2);
 void around(String s,int i1,int i2) : ps(s,i1,i2)
 {
    if()
     {
        //business logic
     }  
    s=image_applet.foo(s);
	
	if()
	 {
	    //Business logic     
	  } 
	
	proceed(s,i1,i2);
 }

I should do same pointcut in .NET using AOP in system inbuild methods.
if it is possible then please give me some direction regarding this.
Thanking you.