Asynchronous Validation from WCF Service

[Matthew]

In my CellValidating Event I am passing the "GridViewCellValidatingEventArgs e" object to a WCF Service Call to compare the field value against a list of valid options in a DB Table.

When the Async process completes (WebService_ValidateColACompleted(object sender, ValidateColACompletedEventArgs e) event) and returns back a Boolean value to indicate the success, if the validation succeeds (e.Result == true), the functionality is field value is left as-is since it is valid.

If the validation fails (e.Result == false), then I am using the e.UserState to reference the original GridViewCellValidatingEventArgs object and am doing the following:

GridViewCellValidatingEventArgs eOrig = ((GridViewCellValidatingEventArgs)e.UserState);

eOrig.ErrorMessage = "Validation failed.";
eOrig.IsValid = false;

Stepping through the code, the ErrorMessage and IsValid values are being updated, but the field in the grid is not turning red or showing the error.

I am assuming this is due to the Asynchronous call, but would like to know a good solution to this issue.

Thanks!

[Vlad]

Hi,

 I suggest you to check this blog post for more info how to achieve your goal. 

Kind regards,
Vlad
the Telerik team