self hierarchy problem on rebind

[Silvio Silva Junior]

Hello guys.

I'm having a problem when using self hierarchy. I'm using this example:
http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/selfreferencing/defaultcs.aspx

I'm doing exactly the same way as it is in this example, but when I do a rebind on the grid, I get the following error:
"No applicable indexer exists in type 'FilesResult'

FilesResult is my datatype of entity framework that is retrieved from the db.

I tryed to use some like this:
 if (Assembly.GetAssembly(typeof(ScriptManager)).FullName.IndexOf("3.5") != -1 || Assembly.GetAssembly(typeof(ScriptManager)).FullName.IndexOf("4.0") != -1)
        {
            RadGrid1.MasterTableView.FilterExpression = "it.arq_int_codigo_pai = Convert.DBNull";
        }
        else
        {
            RadGrid1.MasterTableView.FilterExpression = "arq_int_codigo_pai IS NULL";
        }
but I received the error: 

Operator '=' incompatible with operand types 'Int32?' and 'Object'

 
What can I use when using entity framework?

What's wrong?

Regards.

[Shawn]

I'm running into a similar issue "No applicable indexer exists in type 'EntityDataSourceWrapper'"

I'm trying to use that same example for a Dynamic Data site that is using a custom template.

[Silvio Silva Junior]

Hey Shaw, for me it was fixed setting EnableLinqExpression = "false" in the grid parameters.

http://www.telerik.com/community/forums/aspnet-ajax/grid/self-referencing-hierarchy-using-linq-and-nullable-guids.aspx

Regards.

[Shawn]

Perfect - just what I needed!

Thanks