Server Error in '/' Application.

Object reference not set to an instance of an object.

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.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 1932:            string str = "";
Line 1933:            OleDbDataReader dr = con.DrSelect(sql, null);
Line 1934:            if (dr.Read())
Line 1935:            {
Line 1936:                string sql_ = "select * from " + param[2] + " where id=" + id;

Source File: f:\netweb\hl_netweb\App_Code\jss_fc\JSSMethods.cs    Line: 1934

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   jss_fc.JSSMethods.mt_infodisplay(String tagename, OperateDB con, String id, String[] param) in f:\netweb\hl_netweb\App_Code\jss_fc\JSSMethods.cs:1934
   jss_fc.JSSMethods.TAGES_SINGLE(String tagename, OperateDB con, String[] param, String[] idsparam) in f:\netweb\hl_netweb\App_Code\jss_fc\JSSMethods.cs:83
   info.Page_Load(Object sender, EventArgs e) in f:\netweb\hl_netweb\info.aspx.cs:63
   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

Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053