[InvalidOperationException: Sequence contains no elements]
System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +1217
System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +120
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +360
System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +58
System.Linq.Queryable.First(IQueryable`1 source) +220
BEDataContext.GetFile(Int32 ID_File) in D:\Data\www\www.bibliothecaEconomica.cz\App_Code\BEDataContext.vb:411
download.Page_Load(Object sender, EventArgs e) in D:\Data\www\www.bibliothecaEconomica.cz\library\file\download.aspx.vb:11
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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