Catching base Exception class in .NET

catch (Exception ex)

catch (Exception ex){}

catch (Exception ex){ return false; }

catch (Exception ex)

try {something} catch (SqlException) {do stuff} catch (Exception) {do other stuff}

try {
   myThing.DoStuff();
}
catch (StuffGoneWrongException ex) {
   //figure out what you need to do or bail
}