Hi all,

I'm using a WebHierarchicalDataGrid in NetAdvantage 2010.2.  When I click on a row, I can get to a server-side method using the AutoPostBackFlags feature.  But I continuously get the following when I click on a child-row: 

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

The full stack trace is:

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

Infragistics.Web.UI.Framework.RunBot.RenderPageCallBack(HtmlTextWriter writer, Control control) +50

System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +256

System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19

System.Web.UI.Page.Render(HtmlTextWriter writer) +29

System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27

System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99

System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266

Because I've gone back and forth with this, I made a real simple page to display this issue.  I'd like to use this control but it's a hard sell when I can't react to a click on the server side.  Can anyone help me with this?

Thanks,

Bill

Here is the aspx page:

<%

@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestGridRowClick.aspx.cs" Inherits="testProject.TestGridRowClick" %>

<!

 

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<

 

html xmlns="http://www.w3.org/1999/xhtml" >

<

 

head runat="server">

 

<title>Untitled Page</title>

</

 

head>

<

 

body>

 

<form id="form1" runat="server">

 

<asp:ScriptManager ID="ScriptManager1" runat="server">

 

</asp:ScriptManager>

 

<div>

 

<ig:WebHierarchicalDataGrid ID="whdg1" runat="server" DataSourceID=""

 

AutoGenerateColumns="false" AutoGenerateBands="false" InitialExpandDepth="0"

 

InitialDataBindDepth="-1" Height="350" Width="100%" DataKeyFields="ID"

 

ExpandableAreaCssClass="ighg_FeatureBrowserExpandableArea" EnableViewState="true" EnableAjax="true" EnableAjaxViewState="true"

 

MaxDataBindDepth="5"

 

OnRowSelectionChanged="whdg1_RowSelectionChanged"

 

>

 

<ExpandCollapseAnimation SlideOpenDirection="Auto" SlideOpenDuration="0" SlideCloseDirection="Auto"

 

SlideCloseDuration="0" />

 

<Columns>

 

<ig:BoundDataField DataFieldName="SubordinateItem" Key="SubordinateItem" Header-Text="Item" Width="10%"/>

 

<ig:BoundDataField DataFieldName="SubordinateName" Key="SubordinateName" Header-Text="Item Name" Width="90%" />

 

</Columns>

 

<Behaviors>

 

<ig:VirtualScrolling Enabled="true" RowCacheFactor=".5" ScrollingMode="Deferred"></ig:VirtualScrolling>

 

<ig:Selection Enabled="true" CellClickAction="Row" RowSelectType="Single">

 

<AutoPostBackFlags RowSelectionChanged="true" />

 

</ig:Selection>

 

</Behaviors>

 

<Bands>

 

<ig:Band DataMember="itemRollupSource_DefaultView" Key="ID" ShowHeader="true"

 

ShowFooter="false" IsSelfReference="true" AutoGenerateColumns="false" >

 

<Columns>

 

<ig:BoundDataField DataFieldName="SubordinateItem" Key="SubordinateItem" Header-Text="Item" Width="10%"/>

 

<ig:BoundDataField DataFieldName="SubordinateName" Key="SubordinateName" Header-Text="Item Name" Width="90%" />

 

</Columns>

 

</ig:Band>

 

</Bands>

 

</ig:WebHierarchicalDataGrid>

 

<ig:WebHierarchicalDataSource ID="itemRollupSource" runat="server">

 

<DataRelations>

 

<ig:DataRelation ChildColumns="SubordinateParentItem" ChildDataViewID="itemRollupSource_DefaultView"

 

ParentColumns="SubordinateItem" ParentDataViewID="itemRollupSource_DefaultView" />

 

</DataRelations>

 

<DataViews>

 

<ig:DataView ID="itemRollupSource_DefaultView" />

 

</DataViews>

 

</ig:WebHierarchicalDataSource>

 

</div>

 

</form>

</

 

body>

</

 

html>

Here is my code-behind:

protected void Page_Init(object sender, EventArgs e)

{

BindGrid();

}

protected List<myHierarchy> _getSampleData()

{

List<myHierarchy> resultList = new List<myHierarchy>();

resultList.Add(

new myHierarchy(){ID=1, TopLevelItem="x", SubordinateParentItem=null, SubordinateItem="x", SubordinateName="X Name"});

resultList.Add(

new myHierarchy() { ID = 2, TopLevelItem = "x", SubordinateParentItem = "x", SubordinateItem = "x1", SubordinateName = "X1 Child Name" });

resultList.Add(

new myHierarchy() { ID = 3, TopLevelItem = "x", SubordinateParentItem = "x", SubordinateItem = "x2", SubordinateName = "X2 Child Name" });

resultList.Add(

new myHierarchy() { ID = 4, TopLevelItem = "x", SubordinateParentItem = "x", SubordinateItem = "x3", SubordinateName = "X3 Child Name" });

resultList.Add(

new myHierarchy() { ID = 5, TopLevelItem = "x", SubordinateParentItem = "x3", SubordinateItem = "x31", SubordinateName = "X31 Child Name" });

return resultList;

}

public void BindGrid()

{

string currentItem = "x";

List<myHierarchy> listResult = _getSampleData();

Infragistics.Web.UI.DataSourceControls.

DataView view = itemRollupSource.DataViews.FindByID("itemRollupSource_DefaultView");

if (view == null)

{

new Infragistics.Web.UI.DataSourceControls.DataView();

view.ID =

"itemRollupSource_DefaultView";

itemRollupSource.DataViews.Add(view);

}

view.DataSource = listResult;

"itemRollupSource";

}

protected void whdg1_RowSelectionChanged(object sender, Infragistics.Web.UI.GridControls.SelectedRowEventArgs e)

{

SelectedRowCollection src = e.CurrentSelectedRows;

if (src.Count > 0)

{

string itemSelected = src[0].Items[0].Text;

}

// fill another grid

public class myHierarchy

public int ID {get; set;}

public string TopLevelItem {get; set;}

public string SubordinateParentItem {get; set;}

public string SubordinateItem {get; set;}

public string SubordinateName {get; set;}

}

}