am using infragistics version 10.3.20103.2217, and a hierarchial grid. There are three bands and summary column on the third hierarchy. My application needs expanding and collapsing the complete grid and so I have given two buttons to do the same in UI.

when page is loaded, I expand using the exposed function ExpandAll().

If a user clicks to collapse, I use the function CollapseAll(),

but then if user tries to expand again, there is a null reference exception.

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: 

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
   Infragistics.Web.UI.GridControls.SummaryRow.GetSummaryValue(GridField field, Summary summary, ColumnSummaryInfo colSumInfo, SummaryRowSetting sumRowSetting, Boolean raiseEvnt) +366
   Infragistics.Web.UI.GridControls.SummaryRow.BehaviorEvents_PreRender(Object sender) +898
   Infragistics.Web.UI.GridControls.PreRenderHandler.Invoke(Object sender) +0
   Infragistics.Web.UI.GridControls.GridBehaviorEvents.OnPreRender() +74
   Infragistics.Web.UI.GridControls.GridBot.HandlePreRender() +67
   Infragistics.Web.UI.GridControls.ContainerGridBot.HandlePreRender() +332
   Infragistics.Web.UI.Framework.Data.FlatDataBoundControl.OnPreRender(EventArgs e) +1956
   Infragistics.Web.UI.GridControls.WebDataGrid.OnPreRender(EventArgs e) +37
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

Hello whanes,

If you have any questions please feel free to contact me.

Hi whanes,

I was not able to reproduce the issue. However, I created a small sample, replicating your scenario. Please refer to the attached sample and confirm if you are experiencing the same behavior. I used NetAdvantage 11.2.20112.2055.

Please let me know if this helps.

I am running v11.2, I downloaded from you guys about a week ago so I assume it is the latest release.

I am not sure what you mean about Parent or Child, but there is only a single band in the grid, however i do Group it pro grammatically first. 

As far as a code sample

It goes like so 

// Sample Start

  grdResults.DataSource = GetDataSet();

  grdResults.DataBind();

  grdResults.GroupingSettings.GroupedColumns.Add("OrderNumber");

// Sample End

Then on the grid I click the summary button and  select Sum, I get the error stated above.