silverlight 4.0 - query to wcf ria service call -

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i have domain service class contain simple poco object , class contain 2 variable , b , method make sum of it.

public class domainservice1 : domainservice     {         abc obj = new abc(10, 20);         public int sum1()         {             return (obj.a + obj.b);           }      }     public class abc {         public int { get; set; }         public int b { get; set; }           public abc(int c, int d)         {             = c;             d = b;          }          } }

i wish learn, how can make call wcf ria service @ mainpage @ silverlight?

you can call service on silverlight side way:

domainservice1 domainservice = new domainservice1(); domainservice.sum1((op) =>  {     //op.value has result }, null);

or

domainservice1 domainservice = new domainservice1(); domainservice.sum1(sum1completed, null);  (...)  void sum1completed(invokeoperation<int> op) {     //op.value has result }

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