Exception handling in c#.net

exception handling in c#.net,try,catch,finaly,throw
hen an exception is thrown, the common language runtime (CLR) looks for the catch statement that handles this exception. If the currently executing method does not contain such a catch block, the CLR looks at the method that called the current method, and so on up the call stack. If no catch block is found, then the CLR displays an unhandled exception message to the user and stops execution of the program
catch (InvalidCastException e)
{
if (e.Data == null)
{
throw;
}
else
{
// Take some action.
}
}
class ThrowTest3
{
static void ProcessString(string s)
{
if (s == null)
{
throw new ArgumentNullException();
}
}

static void Main()
{
try
{
string s = null;
ProcessString(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);
}
}
}
/*
Output:
System.ArgumentNullException: Value cannot be null.
at Test.ThrowTest3.ProcessString(String s) ... First exception caught.
*/
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