哪一个：

using (var myObject = new MyClass())
{
   try
   {
      // something here...
   }
   catch(Exception ex)
   {
      // Handle exception
   }
}

或者

try
{
   using (var myObject = new MyClass())
   {
      // something here...
   }
}
catch(Exception ex)
{
   // Handle exception
}