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 89:         cn.Open();
Line 90:         cmd = new SqlCommand("select procat from tbl_procategory where display = 'y' and pcid = " + Request.QueryString["cid"].ToString(), cn);
Line 91:         Label2.Text = cmd.ExecuteScalar().ToString();
Line 92:         cn.Close();
Line 93:         da = new SqlDataAdapter("select * from tbl_subcategory where display = 'y' and cid =" + Request.QueryString["cid"].ToString(), cn);

Source File: d:\HostingSpaces\palmancontrols.com\palmancontrols.com\wwwroot\subcategory.aspx.cs    Line: 91

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   subcategory.getvalue() in d:\HostingSpaces\palmancontrols.com\palmancontrols.com\wwwroot\subcategory.aspx.cs:91
   subcategory.Page_Load(Object sender, EventArgs e) in d:\HostingSpaces\palmancontrols.com\palmancontrols.com\wwwroot\subcategory.aspx.cs:24
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4081.0