Yes for a WCF Service use the Name property of OperationContractAttribute class

EXAMPLE:

[ServiceContract]
interface ddd
{
[OperationContract(Name = "ONE")]
int calc(int a,int B);
[OperationContract(Name = "TWO")]
double calc(double a,double b);
}

1. For a Web Service use the MessageName property of WebMethodAttribute class
2. Please comment the following line in the .cs file of the Web Service

//[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[WebMethod]
public string HelloWorld(string a) {
return "HELLO"+" "+a;
}
[WebMethod(MessageName="second")]
public string HelloWorld()
{
return "Hello second";
}

Yes for a WCF Service use the Name property of OperationContractAttribute class

example:

[ServiceContract]
interface ddd
{
[OperationContract(Name = "one")]
int calc(int a,int b);
[OperationContract(Name = "two")]
double calc(double a,double b);
}

//[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[WebMethod]
public string HelloWorld(string a) {
return "Hello"+" "+a;
}
[WebMethod(MessageName="second")]
public string HelloWorld()
{
return "Hello second";
}