“/”应用程序中的服务器错误。

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行 68:         DataTable dt = new DataTable();
行 69:         OleDbDataAdapter da = new OleDbDataAdapter(sql, Connection);
行 70:         da.Fill(dt);
行 71:         connection.Close();
行 72:         return dt;

[NullReferenceException: 易胜博备用网址_易胜博体育在线]
   System.Data.OleDb.OleDbConnection.ValidateTransaction(OleDbTransaction transaction, String method) +18
   System.Data.OleDb.OleDbCommand.ValidateConnectionAndTransaction(String method) +40
   System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) +56
   System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) +116
   System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +4
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +130
   System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162
   System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +115
   DBHelper.GetDataSet(String sql) in f:\usr\localuser\qyw35261\App_Code\DBHelper.cs:70
   index.Page_Load(Object sender, EventArgs e) in f:\usr\localuser\qyw35261\index.aspx.cs:18
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627