Some developers made this mistake when they catch an Exception and later rethrow them.

try {
  // something went wrong here
} catch (Exception ex)
{
    throw ex; //mistake here
}

How many of you do this? Do you know what is wrong here?

When you code throw ex; you are essentially throwing an except from this point onwards, discarding the original exception and information that you catch earlier. The trace from this point onwards would only go to where you are issuing the throw ex; statement.

What is the correct statement then?

try {
  // something went wrong here
} catch (Exception ex)
{
    throw;
}

Hope this helps!