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 27:     public void showdata()
Line 28:     {
Line 29:         SqlDataAdapter da = new SqlDataAdapter("select * from Memorable_Clicks where status='" + 'y' + "' and Category='" + Request.QueryString["Category"].ToString() + "' order by id desc", con);
Line 30:         DataTable dt = new DataTable();
Line 31:         da.Fill(dt);

Source File: g:\pleskvhosts\jkgisi.com\thakurdwaraschool.com\Gallery3\Default.aspx.cs    Line: 29

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   Gallery3_Default.showdata() in g:\pleskvhosts\jkgisi.com\thakurdwaraschool.com\Gallery3\Default.aspx.cs:29
   Gallery3_Default.Page_Load(Object sender, EventArgs e) in g:\pleskvhosts\jkgisi.com\thakurdwaraschool.com\Gallery3\Default.aspx.cs:23
   System.Web.UI.Control.OnLoad(EventArgs e) +107
   System.Web.UI.Control.LoadRecursive() +89
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0