return custom error message after cancel a server side event (C#)

shuminliu

On the server side I check if a record can be removed. if not I'd like to return a custom error message to the user to explain why it can't be deleted:

editor.PreRemove += (sender, e) =>
{
if (CannotBeDeleted(...))
{
e.Cancel = true;
return;
}
}

I'm wondering where I can add the message like "This record is a special one that you have to keep".

Thanks!

Shumin

allan

Hi Shumin,

Use a validator rather than event handler if you want to return a message to the client-side.

As the docs mention:

please note that this is not a replacement for validation - no error will be shown to the end user if the processing of a row is cancelled!

That said, there probably should be a mechnaisim for feedback rather than just nothing happening. I will look at that in future, but for now, use a validator.

Allan

shuminliu

Got it. Thanks!