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[Solved] Column Headers disappear if more than 200 columns bind to Grid.

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Venu Madhav Deevi asked on 22 Dec 2009, 07:21 AM

Hi,

We are facing a strange issue with Rad Grid control, we have to generate a report of having more than 200+ columns and when this data was bind to Rad Grid control it is getting the data on to grid initially with visible columns and then when we scroll horizontally to some extent roughly around 150+ or 200+ columns then suddenly Column headers will disappear from the Rad Grid, however the data values are still visible for the columns. We also observed that Grid will display the contents in disabled mode (with blue background and grid lines disappear after scrolling to 150+ or 200+ columns) on further scrolling of Grid horizontally.

Column headers were disappeared even when we scroll to first column from disappeared position, i.e. they were permanently removed for the Rad Grid. When we refresh the page again we can get the column headers for visible columns.

This behavior was observed with several data tables which were having more than 200+ columns and bind to Rad Grid control, please let us know is this a bug in Rad Grid or is there any limitations for Column headers in Rad Grid control.

Thanks & Regards,
Venu Madhav Deevi.

4 Answers, 1 is accepted

answered on 24 Dec 2009, 10:28 AM

column-header-disappear-grid-view-error.JPG

Hi Vlad,

Thanks for your reply, We are using "Q3 November 3rd Release of Telerik Rad Controls." version of Telerik controls for application and we also enabled "EnableColumnVirtualization" property true, even then the columns headers in the Grid will disappear once we scroll horizontally to 150+ or 200+ columns and Grid will display the contents in disabled mode (with blue background and grid lines disappear after scrolling to 150+ or 200+ columns).

Following is our RadGrid declaration in our Xaml file:

"<telerik:RadGridView x:Name="dgReportView" VerticalAlignment="Center" HorizontalAlignment="Center" IsReadOnly="True"
          Canvas.Top="373" Canvas.Left="55" AreRowDetailsFrozen="False"
          Grid.ColumnSpan="5" Foreground="Black" Grid.RowSpan="1" Grid.Row="5"
          FontFamily="Arial" FontSize="11" FontWeight="Bold" AutoGenerateColumns="False"
          ShowGroupPanel="True" EnableColumnVirtualization="True" >
</telerik:RadGridView>"

These column headers were removed permanantly from Grid until we refresh the page.

You can replicate this scenario by using Rad Grid control binded to any Table or Data from an Xml file having 250 columns or elements and having 1000 records.

Please let us know how we can attach the code sample to replicate the scenario.

Thanks & Regards,
Venu Madhav Deevi.

answered on 28 Dec 2009, 12:16 PM

Hi Venu Madhav Deevi,

I have tried to replicate your scenario following your instructions and using the dlls from our service pack - Q3 2009 SP1, but unfortunately I was not able to.
Maybe I am doing something differently than you and that is why I cannot reproduce the behavior.
If you could send us your project (via support ticket)- that would be of great help for us to debug it and identify what the problem could be.

Thanks in advance.

Greetings,
Anastasia
the Telerik team

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