Multiple controls with the same ID 'rc_' were found. FindControl requires that controls have unique IDs. RadPivotGrid

[asad]

I am receiving this error if I fetch data from view which has column names in arabic.
Steps to reproduce:

Provide  following query on RadPivotGrid1_NeedDataSource

string query = "SELECT شهر, الوفيات FROM [ViewName]";
(sender as RadPivotGrid).DataSource = GetDataTable(query);

if we provide one arabic name this pivot table renders successfully, If there are more than one arabic columns, page crashes with following message

Multiple controls with the same ID 'rc_' were found. FindControl requires that controls have unique IDs.

[HttpException (0x80004005): Multiple controls with the same ID 'rc_' were found. FindControl requires that controls have unique IDs.]

   System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +233

   System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) +311

   System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +306

   System.Web.UI.Control.FindControl(String id) +12

   Telerik.Web.UI.PivotGridFieldsWindow.AddAttributesToRender(HtmlTextWriter writer) +76

   System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +20

   Telerik.Web.UI.RadWebControl.RenderBeginTag(HtmlTextWriter writer) +36

   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +20

   Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer) +92

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   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) +128

   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8

   System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10

   Telerik.Web.UI.RadCompositeDataBoundControl.RenderContents(HtmlTextWriter writer) +115

   Telerik.Web.UI.RadPivotGrid.RenderContents(HtmlTextWriter writer) +94

   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32

   Telerik.Web.UI.RadCompositeDataBoundControl.Render(HtmlTextWriter writer) +92

   Telerik.Web.UI.RadPivotGrid.Render(HtmlTextWriter writer) +275

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100

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

   Telerik.Web.UI.RadAjaxPanel.RenderChildren(HtmlTextWriter writer) +218

   System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10

   Telerik.Web.UI.RadAjaxPanel.RenderContents(HtmlTextWriter writer) +45

   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +32

   Telerik.Web.UI.RadAjaxPanel.Render(HtmlTextWriter writer) +80

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100

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

   Telerik.Web.UI.ControlRenderer.Render(HtmlTextWriter writer) +161

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   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) +128

   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) +57

   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) +128

   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8

   System.Web.UI.UpdatePanel.RenderChildren(HtmlTextWriter writer) +248

   System.Web.UI.UpdatePanel.Render(HtmlTextWriter writer) +37

   Telerik.Web.UI.OurUpdatePanel.Render(HtmlTextWriter writer) +464

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100

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

   Telerik.Web.UI.PreControlToAjaxify.Render(HtmlTextWriter writer) +208

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   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) +128

   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +216

   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +32

   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +53

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +57

   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100

   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +40

   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +128

   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8

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

   System.Web.UI.Adapters.ControlAdapter.Render(HtmlTextWriter writer) +17

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +106

   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100

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

   Telerik.Web.UI.RadAjaxControl.RenderPageInAjaxMode(HtmlTextWriter writer, Control page) +1222

   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +268

   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8

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

   System.Web.UI.Adapters.ControlAdapter.Render(HtmlTextWriter writer) +17

   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +106

   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100

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

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1386



I Investigated and found that issue is because when generating span id RadPivotGrid uses column name as part of control name
and it does not consider the arabic character for the id attribute.

If arabic character can not be used then PivotGrid should append a counter with the id so that it does not generate the duplicate id.

Following is the HTML generated with one arabic column and one english column

<td class="rpgFilterZone" colspan="2">
<span id="RadPivotGrid1_ctl00_ctl00_SpanPanelFieldsPopup" class="rpgFieldsPopup">
<span class="rpgFieldsPopupWrapper">
<span id="RadPivotGrid1_ctl00_ctl00_rc_" class="rpgFieldItem">شهر</span>
<span id="RadPivotGrid1_ctl00_ctl00_rc_Year" class="rpgFieldItem">Year</span>
</span><span class="rpgGroupedFieldsTitle">All Fields</span></span>
</td>

[Deyan Enchev]

Hi Asad,

We are aware of this issue when using Arabic characters for UniqueName. Currently our development department is working on a fix for this.

Until this gets fixed you can use Arabic characters for the column Caption and Latin for UniqueName. This way you should not see the error because SPAN IDs are generated from the values set to UniqueName.

Regards,
Deyan Enchev
Telerik