System.InvalidOperationException: Sequence contains no elements at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) at System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute[TResult](Expression expression) at System.Linq.Queryable.Single[TSource](IQueryable`1 source, Expression`1 predicate) at sedoc.B2B.BusinessLogic.B2BFactory.GetUserInfo(String customerID) in D:\Dati\App.NET\Web\Foto-Direct\VETRINA\B2BBusinessLogic\B2BFactory.cs:line 893 at sedoc.B2B.ToolsVetrina.Vetrina.Get_UtentiAbilitati(String Codice) in D:\Dati\App.NET\Web\Foto-Direct\VETRINA\B2BToolsVetrina\Vetrina.cs:line 40 at _Default.Page_Load(Object sender, EventArgs e) Foto-direct.it