[RESOLVED] Method overridiing Issue

[firoz.raj]

can anybody tell me ?why saying invalid token.

using System;
 class baseIO
         {
        public string FileName;
            public int Delete()
              {
            Console.Writeline("This is the delete Method of the BaseIO Class");
            return(0);
               }
              
              class imageIO :baseIO 
                 {
               public string imgformat;
               public int alphaBlend()
                    {
                   Console.WriteLine ("This is the alpha Blending method of the imageIO Class");
                   return(0);
                     }
                  }
           class Test
             {
           static void Main()
             {
            imageIO obj=New imageIO();
            obj.FileName ="ffffffff";
            obj.Delete();
                   }
                  }