public void AddMethod(string methodName, string[][] args) { string apiUri = "http://emailservice/"; var method = Soap.CreateElement("api:" + methodName, apiUri); //method.Prefix = "api"; foreach (var arg in args) { var ele = Soap.CreateElement(arg[0]); ele.InnerText = arg[1]; method.AppendChild(ele); } Body.AppendChild(method); }