set validation error on cell from outside grid

[Jim]

In my CellValidating handler I can set my cell to show the red validation error with 

        e.IsValid = false;
        e.ErrorMessage = "OrderNO must be longer than five characters.";

But is it possible to set this from outside the grid, i.e. when an async lookup returns some while later.
Thanks
Jim

[Jim]

I guess it's not possible!
The only way I can get async validation to work is to use

INotifyDataErrorInfo

on the data objects.
So I and add and remove erros from the object and this show on the grid.
Jim

[Maya]

Hello Jim,

Indeed, you can work with INotifyDataErrorInfo. Please take a look at this blog post for a reference.
 

Kind regards,
Maya
the Telerik team

[Jim]

Yes it seems to work OK
Thanks
Jim