Server Error in '/' Application.

Connection must be valid and open

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Connection must be valid and open

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidOperationException: Connection must be valid and open]
   MySql.Data.MySqlClient.MySqlCommand.CheckState() +160
   MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery() +33
   www.swp.com.DataHelper.ExecuteSQL(String sSQL) +220
   www.swp.com.PaperInfo.Update_Abstract_download(String sPaper_ID) +463
   www.swp.com.Abstract.Page_Load(Object sender, EventArgs e) +348
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Control.LoadRecursive() +134
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4110.0