You can check the following code. For more I have provided the link for reference. [ServiceContract] public interface ITest { [OperationContract(Name= Method1 )] string TestMethod( int para1 int para2); // Initail method [OperationContract(Name = Method2 )] string TestMethod( string para1 string para2); // Overloading on the basis of type of parameters. [OperationContract(Name = Method3 )] string TestMethod( int para1 string para2); // Overloading on the basis of an order of parameters. [OperationContract(Name = Method4 )] string TestMethod( int para1 string para2 double para3); // Overloading on the basis of the numbers of parameters } } using WCFConsoleClentApp.MyTest; namespace WCFConsoleClentApp { class Program { static void Main(string[] args) { TestClient client = new TestClient(); string callMethod1 = client.Method1(1 1); string callMethod2 = client.Method2(Test Test); string callMethod3 = client.Method3(1 Test); string callMethod4 = client.Method4(1 Test 3.5); } } } I used the link below http://www.codeproject.com/Tips/656042/Method-Overloading-in-WCF