radGrid export to Excel dataSource error

[Art Kedzierski]

I have a RadGrid that is filled with a SqlDataSource and an Export to ExcelML button that throws the following error when i try to export it:

Telerik.Web.UI.NullEnumerableException: Cannot perform this operation when DataSource is not assigned

There is obviously data in the grid so the DataSource must be assigned. I can find no reference to this error anywhere.

[Daniel]

Hello Art,

This is not a common error. Can you please post your code here? This way I will be able to provide more to-the-point answer.

Best regards,
Daniel
the Telerik team

[Art Kedzierski]

I've moved this to a support ticket so I could send the entire solution.

[Daniel]

Hello Art,

Thank you for the sample project. I suggest that we move this conversation to the support ticket. I will update this forum thread when we find what is causing the issue.

Regards,
Daniel
the Telerik team

[Blake]

I'm actually getting a similar error now myself, whats the support ticket reference, below is an example code block i have, its a nested list view in another list view, and on the databind it has it but checking the entity itself just through a watch, it has the object assigned.

protected void enquiryDetail_ItemDataBound(object sender, Telerik.Web.UI.RadListViewItemEventArgs e)
       {
           if (e.Item.ItemType == Telerik.Web.UI.RadListViewItemType.AlternatingItem ||
               e.Item.ItemType == Telerik.Web.UI.RadListViewItemType.DataItem)
           {
               Telerik.Web.UI.RadListView radList = (Telerik.Web.UI.RadListView)e.Item.Parent.Parent;
               mes.business.data.Enquiry dataItem = (mes.business.data.Enquiry)radList.Items[0].DataItem;

               Telerik.Web.UI.RadListView view = (Telerik.Web.UI.RadListView)e.Item.FindControl("productPackageList");
               if (dataItem.PackageEnquiries.Count == 0)
                   view.DataSource = new List<mes.business.data.PackageEnquiry>();
               else
                   view.DataSource = dataItem.PackageEnquiries; view.DataBind();


           }
       }

[Daniel]

Hello Blake,

Art sent a sample project however we were unable to reproduce the issue locally.
Your scenario seems to be completely different so I would ask that you provide either a runnable demo or instructions describing how to recreate this behavior.

Regards,
Daniel
the Telerik team