Here ParameterService is a Service name on references and ParameterServiceSoapClient is a class name on autogenerated file reference.cs .
public void TestMethod()
{
try
{
ParameterService.ParameterServiceSoapClient FObjFetchParameters = new ParameterService.ParameterServiceSoapClient();
DataSet dtSurnoc = new DataSet();
dtSurnoc = FObjFetchParameters.GetSNo(24,1,3,5,12);
}
catch (Exception ex)
{
throw;
}
}