How to rethrow exception in C#.

When a exception is caught and it is necessary to process the exception and rethrow it, then statement throw can be used.

If it is necessary to throw new exception:

try
{
   throw exp;
}
catch (Exception e)
{
   Debug.Write(e.Message);  // Exception processig

   throw new Exception("DoException", e);
}
  

If it is necessary to throw caught exception next:

try
{
   throw exp;
}
catch (Exception e)
{
   Debug.Write(e.Message);  // Exception processig

   throw;
}

First code will generate exception System.Exception and second code will generate exception exp (in our test sample Exception1).

Console output:

All sources can be download from google code project csharp-tips "google code" project

Additional Links:

throw (C# Reference)