Performance overhead of using attributes in .NET

Question

1.. Is there any performance overhead caused by the usage of attributes? Think for a class like:

    public class MyClass
    {
       int Count {get;set;}
          


        

Answer 1

Jon Skeet is absolute right and I only want to give one additional notion:

If you have a look at the base class of all attributes, System.Attribute, you'll notice, that most of its members are static. So they exist only once, no matter how many Attribute instances you have.

This is just another point to underline, that Attributes are not too costly...