Enforce security inaspx. 3.5

// this piece of code will make the controls visible for 104 role only   
if (Global.enforceSecurity)
    if (!User.IsInRole("104"))
    {
      myDataGrid.EditButtonVisible = false;
      myDataGrid.AddButtonVisible = false;
      myDataGrid.DeleteButtonVisible = false;
    }
Vs
// this piece of code will make the controls visible for 104 role only
    if (User.IsInRole("104"))
    {
      myDataGrid.EditButtonVisible = true;
      myDataGrid.AddButtonVisible = true;
      myDataGrid.DeleteButtonVisible = true;
    }
The question, is there any difference in the implementation b/e both codes above? or if you have a better code than what I have presented. please share your code and experience
 
thanks
Bob