Retaining Entered Data When Using Custom Validation

[Richard Weeks]

I have a RadGrid that takes data from a business object of some sort. I use the Microsoft Enterprise Library 4.1 to conduct validation on the object by decorating with a [HasValidation] attribute and handling accordingly.

I'm having problems working out how to just pass back validation errors without ending the insert / update process. I'll elaborate.

For:

OnUpdateCommand="TelerikGrid_OnUpdateCommand"

I have:

protected void TelerikGrid_OnUpdateCommand(object source, GridCommandEventArgs e)
{
    this.businessObject = new BusinessObject();

    this.businessObject.GetGridValues(e);

    var validationResults = Validation.Validate(this.businessObject);

    if (validationResults.IsValid)
    {
        this.businessObjectData = new BusinessObjectData();

        int updateResult = this.businessObjectData.Update(this.businessObject);

        switch (updateResult)
        {
            case -1:

                this.Master.FeedbackText = "Not updated.";

                break;

            default:

                this.Master.FeedbackText = "Updated.";

                break;
        }
    }
    else
    {
        this.Master.FeedbackText = string.Format(
            "Errors found in submission: {0}",
            ValidationHelper.GetErrors(validationResults, false));
    }
}

Everything works very well but if there are validation errors, the errors are displayed but the grid appears to rebind, collapsing the edit form and losing all the entered values in the process.

How can I retain the values entered and stop the edit form collapsing when the data fails validation?

Regards,
Richard

[Martin]

Hello Richard,

I would suggest that you set e.Canceled="true" inside your UpdateCommand event handler when the validation fails:

protected void TelerikGrid_OnUpdateCommand(object source, GridCommandEventArgs e)
{
    ...
    if (validationResults.IsValid)
    {
        ...
    }
    else
    {
            this.Master.FeedbackText = string.Format(
            "Errors found in submission: {0}",
            ValidationHelper.GetErrors(validationResults, false));
            e.Canceled = true;
    }
}

I hope this helps.

Sincerely yours,
Martin
the Telerik team

[Richard Weeks]

/facepalm

That's the ticket, thanks.

Richard