System.ArgumentNullException: Value cannot be null 什么原因.
if (dater == null)
dater = new OleDbDataAdapter();
dater.SelectCommand =new OleDbCommand(@"select * from [NsUser]"/* where UserID='"+pwd+"'"*/,Conn);
dater.Fill(ds);
//数据库已经打开. 执行 dater.fill(ds)的时候 出现:
System.ArgumentNullException: Value cannot be null.
Parameter name: dataSet
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
at ConnectDatabase.DateBaseUserLogin(Int32 userId, String pwd) in d:\NetStudy\NetStudyService\App_Code\ConnectDatabase.cs:line 35
at Service.UserLogin() in d:\NetStudy\NetStudyService\App_Code\Service.cs:line 28
帮忙啊