Cancellation of an update event

[Maurice]

I have an update event but how can I tell the grid the update didn't work out and everything has to be cancelled,

This code doesn't work.

private static async Task MainGridUpdateHandler(GridCommandEventArgs args)
       {
           var item = (EmployeeClusterVM) args.Item;
           if (item.EndDate <= item.StartDate)
           {
               args.IsCancelled = true;
           }
           try
           {
               EmployeeClusterLogic.UpdateEmployeeCluster(item);
           }
           catch (Exception e)
           {
               args.IsCancelled = true;
           }
       }

[Marin Bratanov]

Hi Maurice,

You can see how that can work here: https://github.com/telerik/blazor-ui/tree/master/grid/remote-validation. This sample project also shows how you can show such errors to the user.

I would also recommend you use the Popup Edit Mode of the grid as it can use DataAnnotations for validation and so this date check can be implemented with a rule there, so the user won't be able to submit an update in the first place. You can find a sample rule to compare dates in the DateRangePicker Validation example.

The only issue I can see in the provided snippet is that the method is static, and if it is declared in a component, that could cause issues with accessing it.

Regards,
Marin Bratanov
Progress Telerik