Hi Alex,

I tried your suggestion but still having some issues.

It worked fine in the following case: If I change datasource from "choose datasource" to "datasource 1" and sort by Column "ID", then change datasource to "datasource 2", it clears the sort indicator fine, before it was throwing the error. Now if you sort by column "ID2" then I'm getting following error: Cannot find column ID.

OscarG

I have same problem:

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 219:
Line 220:				string imageHtml = string.Format(ImageElementFormat, imageId, imageUrl, "", imageAlt);
Line 221:                if (column.HeaderCaption.XmlAttributes["postText"] == null || (string)(column.HeaderCaption.XmlAttributes["postText"]) == string.Empty)
Line 222:                    column.HeaderCaption.XmlAttributes["postText"] = imageHtml;
Line 223:                else

Source File: C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\GridControls\WebDataGrid\Behaviors\Sorting\Sorting.cs    Line: 221

[NullReferenceException: Object reference not set to an instance of an object.]
   Infragistics.Web.UI.GridControls.Sorting.AddHeaderImgToCaption(GridField column, SortDirection direction) in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\GridControls\WebDataGrid\Behaviors\Sorting\Sorting.cs:221
   Infragistics.Web.UI.GridControls.Sorting.BehaviorEvents_PreRender(Object sender) in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\GridControls\WebDataGrid\Behaviors\Sorting\Sorting.cs:180
   Infragistics.Web.UI.GridControls.RenderingContentHandler.Invoke(Object sender) +0
   Infragistics.Web.UI.GridControls.GridBehaviorEvents.OnRenderingContent() in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\GridControls\WebDataGrid\Behaviors\GridBehaviorEvents.cs:501
   Infragistics.Web.UI.GridControls.GridRenderer.RenderContents(HtmlTextWriter writer) in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\GridControls\WebDataGrid\GridRenderer.cs:67
   Infragistics.Web.UI.Framework.RunBot.HandleRenderContents(HtmlTextWriter writer, RendererBase renderer) in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\Framework\RunBot.cs:239
   Infragistics.Web.UI.Framework.Data.FlatDataBoundControl.RenderContents(HtmlTextWriter writer) in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\Framework\Data\FlatDataBoundControl.cs:503
   Infragistics.Web.UI.Framework.Data.FlatDataBoundControl.Render(HtmlTextWriter writer) in C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\Framework\Data\FlatDataBoundControl.cs:519
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
......

Error is unstable and appears after asyncronous postback occurs from the DropDownList control (the SelectedIndexChanged event).
The error occurs only when the SelectedIndexChanged is the first postback after login.
If you press F5 on the page before change of DropDownList control - than works fine.

I use NetAdvantage ASP.NET 2010.3.2217 CLR4x (.net 4 framework).

In the process of debugging I found that the value of the variable column is NULL at C:\work\NetAdvantage_ASPNET_20103_2217_CLR4x\Infragistics.Web.UI\GridControls\WebDataGrid\Behaviors\Sorting\Sorting.cs   ( Line:  221).





Hello koneal,

First thing that you should do in this situation is to install the latest Service Release (build 2055) and test if the issue will be present again.

If the latest Service Release does not correct this issue you can attempt to create an empty web site and add grid with the same setup and similar templates, columns, links etc.

If the same exception appears again you should attach this sample and we will debug and test it on our side.

We are using 11.2.20112.1019. Putting together a sample would be difficult with the database and everything. We can certainly send the aspx page and even the master page.

We also have been having some speed issues that seem to be because of the binding of the control located in the Page_Load. It seems the grid needs the binding procedure in the page load to properly function when sorting but when clicking on a command button the binding reoccurs and is slowing down our application.

Hello koneal,

Can you tell me what version and build of our controls do you use in this application?

Since this scenario appears to be more complex (master page, hyperlinks etc.) it will be very helpful if you can attach a runnable sample reproducing this behavior to this thread or provide complete steps to build one.

This will allow us to run and debug it on our side and find the possible cause for this exception.

If the sample is too large or contains private data you can create a support case and attach it there.

I can also create a new support case for you if you have difficulties in creating one yourself.

I am waiting for your reply.