Compiler Error CS1055

An add or remove accessor expected

If your event is not declared as a field, it must define both add and remove accessor functions.

The following sample generates CS1055:

// CS1055.cs
delegate void del();
class Test
{
   public event del MyEvent
   {
      int i;   // CS1055
      // uncomment accessors and delete previous line to resolve
      // add
      // {
      //    MyEvent += value;
      // }
      // remove
      // {
      //    MyEvent -= value;
      // }
   }

   public static void Main()
   {
   }
}