this keyword

The this keyword refers to the current instance of the class. Static member functions do not have a this pointer. The this keyword can be used to access members from within constructors, instance methods, and instance accessors.

The following are common uses of this:

To qualify members hidden by similar names, for example:

public Employee(string name, string alias)
{
this.name = name;
this.alias = alias;
}
To pass an object as a parameter to other methods, for example:

CalcTax(this);

Check out the below link:

http://msdn.microsoft.com/en-us/library/dk1507sz%28VS.71%29.aspx

Thanks -- Vijaya Kadiyala