Msdn: Try-catch

The try-catch statement consistsTryBlock and one or moreCatchClause (specify processing for different exceptions)Program. This statement takes one of the following forms:

 
Try Try-blockCatch (Exception-declaration-1) Catch-block-1Catch (Exception-declaration-2) Catch-block-2...Try Try-blockCatch Catch-block
 

Where:

Try-block

Include exceptions that should be thrown Code.

Exception-Declaration, Exception-declaration-1, Exception-declaration-2

Exception object declaration.

Catch-block, Catch-block-1, Catch-block-2

Contains the exception handling program.

Example
In this example, two catch statements are used. The most specific exception that occurs first is caught.
// Ordering catch clauses
Using system;
Class myclass
{
Public static void main ()
{
Myclass x = new myclass ();
Try
{
String S = NULL;
X. myfn (s );
}

// Most specific:
Catch (argumentnullexception E)
{
Console. writeline ("{0} first exception caught.", e );
}

// Least specific:
Catch (exception E)
{
Console. writeline ("{0} second exception caught.", e );
}

}

Public void myfn (string S)
{
If (S = NULL)
Throw new argumentnullexception ();
}
}

Output

System. argumentnullexception: value cannot be null.
At...
At... first exception caught.