Compiler error ,why

Question

 public class DataEventArgs<T> : EventArgs
    {
        T data;

      public DataEventArgs(T data)
        {
            if (data == null )
            {
                throw new ArgumentNullException("data");
            }
            this.data = data;
        }
   }

above is a simple eventargs class, but when i compiler it in VS2005 July ,
compiler error occured, "opertor '==' cann't apply to operands type 'T' and '<null>'.
who can tell me how to correct it ?

thanks.

Answer 1

I copy-and-pasted into VS2005 beta 2 and there was no problem. I instantiated a class from it using an int.

DataEventArgs<int> r; r = new DataEventArgs<int>(12);

Still no problem. Not even a runtime error

Answer 2

I have find it's a bug of C#, you can find it as below:
http://lab.msdn.microsoft.com/productfeedback/viewfeedback.aspx?feedbackid=d1259993-e550-40e2-9ad0-0041653e5fcf  .

i complier it in VS2005 July , Build 50712.6.

Any way , thank your reply