How to add List<int> to a DataContract of a web service -
    i want create datacontract class 2 different list members. when try start web service, error method, sendemail, not supported test wcf client. data contract:    [datacontract] [knowntype(typeof(int[]))] public class emailinfo {     private string strfromuserid = string.empty;     private string strfromaddress = string.empty;     private string strfromname = string.empty;     private object lstindividualids = null;     private object lstgroupids = null;     private string strsubject = string.empty;     private string strmessage = string.empty;      [datamember]     public string fromuserid     {         { return strfromuserid; }         set { strfromuserid = value; }     }      [datamember]     public string fromaddress     {         { return strfromaddress; }         set { strfromaddress = value; }     }      [datamember]     public string fromname     {         { return strfromname; }         set { strfromname = value; }     }      [datamember]     public object individualids     ...