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[Solved] Problem with rebind method of radgrid

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Grid

This is a migrated thread and some comments may be shown as answers.

onkar walavalkar asked on 18 Aug 2009, 11:51 AM

hi,

I am using radgrid with followin properties.

<ccRad:AppGrid ID="gridVoice" runat="server" Skin="Alg" Width="100%" EnableEmbeddedSkins="False"

GridLines="None" ShowHeader="True" HeaderStyle-Height="29" HeaderStyle-VerticalAlign="Middle"

ToolBarId="toolBarVoice" OnNeedDataSource="gridVoice_NeedDataSource" AutoGenerateColumns="false"

ViewColumns="true" ViewColumnDoPostback="true" OnPreRender="gridVoice_PreRender"

EnableLinqExpressions="true">

I filtered one of the columns. Then I reordered the column. in reorder event I rebind the grid as follows.

void

AppGrid_ColumnsReorder(object source, GridColumnsReorderEventArgs e)

{

this.DataBind();
}

here I am getting following exception.

An unexpected error occurred during the processing of your request.

Possible causes for this could be:

- You might have entered unsupported characters like "<", or invalid data on the page. Kindly check the input and try again.

- The requested feature might not be supported or valid.

You can contact your administrator for further assistance.

Error: Expression expected

Source: Telerik.Web.UI - at Telerik.Web.UI.ExpressionParser.ParsePrimaryStart()

at Telerik.Web.UI.ExpressionParser.ParsePrimary()

at Telerik.Web.UI.ExpressionParser.ParseUnary()

at Telerik.Web.UI.ExpressionParser.ParseMultiplicative()

at Telerik.Web.UI.ExpressionParser.ParseAdditive()

at Telerik.Web.UI.ExpressionParser.ParseComparison()

at Telerik.Web.UI.ExpressionParser.ParseLogicalAnd()

at Telerik.Web.UI.ExpressionParser.ParseLogicalOr()

at Telerik.Web.UI.ExpressionParser.ParseExpression()

at Telerik.Web.UI.ExpressionParser.ParseParenExpression()

at Telerik.Web.UI.ExpressionParser.ParsePrimaryStart()

at Telerik.Web.UI.ExpressionParser.ParsePrimary()

at Telerik.Web.UI.ExpressionParser.ParseUnary()

at Telerik.Web.UI.ExpressionParser.ParseMultiplicative()

at Telerik.Web.UI.ExpressionParser.ParseAdditive()

at Telerik.Web.UI.ExpressionParser.ParseComparison()

at Telerik.Web.UI.ExpressionParser.ParseLogicalAnd()

at Telerik.Web.UI.ExpressionParser.ParseLogicalOr()

at Telerik.Web.UI.ExpressionParser.ParseExpression()

at Telerik.Web.UI.ExpressionParser.Parse(Type resultType)

at Telerik.Web.UI.GridDynamicQueryable.Where(IQueryable source, String predicate, Object[] values)

at Telerik.Web.UI.GridDataTableFromEnumerable.FillData35()

at Telerik.Web.UI.GridDataTableFromEnumerable.FillData()

at Telerik.Web.UI.GridResolveEnumerable.Initialize()

at Telerik.Web.UI.GridResolveEnumerable.EnsureInitialized()

at Telerik.Web.UI.GridEnumerableFromDataView..ctor(GridTableView owner, IEnumerable enumerable, Boolean CaseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields)

at Telerik.Web.UI.GridDataSourceHelper.CreateGridEnumerable(GridTableView owner, IEnumerable enumerable, Boolean caseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields)

at Telerik.Web.UI.GridDataSourceHelper.GetResolvedDataSource(GridTableView owner, Object dataSource, String dataMember, Boolean caseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields)

at Telerik.Web.UI.GridTableView.get_ResolvedDataSource()

at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)

at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)

at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)

at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)

at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback)

at System.Web.UI.WebControls.DataBoundControl.PerformSelect()

at Telerik.Web.UI.GridTableView.PerformSelect()

at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()

at Telerik.Web.UI.GridTableView.DataBind()

at Telerik.Web.UI.RadGrid.DataBind()

at Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason)

at Telerik.Web.UI.RadGrid.Rebind()

at Allegiance.Efm.WebApp.Controls.Voice.Inbox.gridVoice_PreRender(Object sender, EventArgs e) in D:\Allegiance\Development\Source\EFM\WebApp\Controls\Voice\Inbox.ascx.cs:line 1997

at System.Web.UI.Control.OnPreRender(EventArgs e)

at System.Web.UI.WebControls.BaseDataBoundControl.OnPreRender(EventArgs e)

at Telerik.Web.UI.RadCompositeDataBoundControl.OnPreRender(EventArgs e)

at Telerik.Web.UI.RadGrid.OnPreRender(EventArgs e)

at Allegiance.Efm.WebApp.Controls.Rad.AppGrid.OnPreRender(EventArgs e) in D:\Allegiance\Development\Source\EFM\WebApp\Controls\Rad\AppGrid.cs:line 584

at System.Web.UI.Control.PreRenderRecursiveInternal()

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

Please help me to resolve this issue.

1 Answer, 1 is accepted

answered on 20 Aug 2009, 01:17 PM

Hi onkar,

From your code I have noticed that you use Advanced Data-binding (using NeedDataSource event).
You should never call the Rebind() method in a NeedDataSource event handler and you should never call DataBind() as well when using advanced data-binding through NeedDataSource. For MS GridView-like data-binding see Simple Data-binding.
For more information on Advanced data-binding take a look at:
Advanced Data-binding (using NeedDataSource event) help topic
Advanced Data Binding demo

Greetings,
Mira
the Telerik team

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