Grid UnGroup Crash with EnableViewState=false

[loowool]

Dear Telerik,

We have a grid created in code (Q1 2009). When a user drags a column to the group header, it works great. When the column is dragged away from the header it UnGroups correctly.

Recently we started optimizing the application. One thing we did is to set the EnableViewState=false on the Page containing the grid to make the page lighter

<%@Page UICulture="auto" Language="C#" AutoEventWireup="true" EnableViewState="false" CodeFile="T.aspx.cs" Inherits="_T" %>

Everything worked great until we discovered a crash when the column is dragged away from the header. It gives the following dump:

Exception.Message
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Stack Trace
System.Collections.CollectionBase.System.Collections.IList.get_Item(Int32 index)
Telerik.Web.UI.GridGroupByExpressionCollection.get_Item(Int32 index)
Telerik.Web.UI.GridGroupPanel.Ungroup(String index)
Telerik.Web.UI.RadGrid.RaisePostBackEvent(String eventArgument)
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

After various attempts to solve the problem with no luck, we put back the EnableViewState=true on the Page containing the grid:

<%@Page UICulture="auto" Language="C#" AutoEventWireup="true" EnableViewState="true" CodeFile="T.aspx.cs" Inherits="_T" %>

And the crash disappeared.

Note some other grid setting:

        radGrid.GridLines = GridLines.None;

        radGrid.EnableViewState =
        radGrid.AllowMultiRowSelection =
        radGrid.ClientSettings.Selecting.AllowRowSelect =
        radGrid.ClientSettings.Selecting.EnableDragToSelectRows = true;

        radGrid.AllowAutomaticDeletes =
        radGrid.AllowAutomaticInserts =
        radGrid.AllowAutomaticUpdates =
        radGrid.FilterMenu.Visible =
        radGrid.ClientSettings.AllowKeyboardNavigation =
        radGrid.MasterTableView.EnableColumnsViewState =
        radGrid.AutoGenerateColumns = false;

        radGrid.ClientSettings.ClientEvents.OnGridCreated = "GridCreated";
        radGrid.ClientSettings.ClientEvents.OnKeyPress = "GridKeyPressed";
        radGrid.ClientSettings.ClientEvents.OnRowSelected = "GridRowSelected";
        radGrid.ClientSettings.ClientEvents.OnActiveRowChanged = "GridRowChanged";

        radGrid.MasterTableView.CommandItemDisplay = GridCommandItemDisplay.None;

        radGrid.MasterTableView.ClientDataKeyNames = new string[] { "uid" };

        radGrid.ClientSettings.AllowColumnsReorder =
        radGrid.ClientSettings.Resizing.AllowColumnResize =
        radGrid.ClientSettings.Resizing.EnableRealTimeResize =
        radGrid.ClientSettings.Resizing.ClipCellContentOnResize = radGrid.Columns.Count > 2;

        radGrid.ClientSettings.AllowKeyboardNavigation =
        radGrid.ClientSettings.Resizing.ResizeGridOnColumnResize = true;

        radGrid.ClientSettings.ClientEvents.OnRowDblClick = "GridRowDoubleClicked";
        radGrid.MasterTableView.SortExpressions.AllowNaturalSort = false;

        radGrid.ShowGroupPanel =
        radGrid.ClientSettings.AllowDragToGroup =
        radGrid.ClientSettings.Scrolling.AllowScroll =
        radGrid.AllowFilteringByColumn =
        radGrid.ClientSettings.AllowGroupExpandCollapse = true;

        radGrid.GroupingSettings.CaseSensitive = false;

        radGrid.AllowPaging = true;
        radGrid.PagerStyle.Mode = GridPagerMode.Slider;
        radGrid.ClientSettings.Scrolling.SaveScrollPosition =
        radGrid.ClientSettings.Scrolling.UseStaticHeaders =
        radGrid.ClientSettings.Scrolling.AllowScroll = true;
        radGrid.PreRender += new EventHandler(GridPreRender);

Can you please help?

Salah A. Malaeb

[Veli]

Hi loowool,

RadGrid does not manage grouping states when its ViewState is disabled. Please refer to the following help article for more information:

Optimizing ViewState usage

If you need to use grouping in RadGrid, its ViewState should be enabled.

All the best,
Veli
the Telerik team

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