Required Field Validator for Upload in grid

[Jim]

The telerik grid example:
http://demos.telerik.com/aspnet-ajax/controls/examples/integration/raduploadinajaxifiedgrid/defaultcs.aspx?product=upload

has the following:

        protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)
        {
            if (e.Item is GridEditableItem && e.Item.IsInEditMode)
            {
                GridBinaryImageColumnEditor editor = ((GridEditableItem)e.Item).EditManager.GetColumnEditor("Upload") as GridBinaryImageColumnEditor;
                TableCell cell = (TableCell)editor.RadUploadControl.Parent;
                CustomValidator validator = new CustomValidator();
                validator.ErrorMessage = "Please select file to be uploaded";
                validator.ClientValidationFunction = "validateRadUpload";
                validator.Display = ValidatorDisplay.Dynamic;
                cell.Controls.Add(validator);
            }
        }

but it is using a specific column type.
how do I add a required field validator to the upload if I am doing this:

                                        <telerik:gridtemplatecolumn uniquename="Upload" HeaderText="File Name">
                                            <itemtemplate>
                                                <asp:HyperLink ID="hlFile" runat="server" Target="_blank" />
                                            </itemtemplate>
                                            <edititemtemplate>
                                                <telerik:radupload id="RadUpload1" runat="server" ControlObjectsVisibility="None" InitialFileInputsCount="1" />
                                            </edititemtemplate>
                                        </telerik:gridtemplatecolumn>

I noticed this example:
http://demos.telerik.com/aspnet-ajax/grid/examples/generalfeatures/gridattachmentcolumn/defaultcs.aspx
what about validation on the attachment column?

[robertw102]

Just add the CustomValidator control to the EditItemTemplate.

[Jim]

I don't think that will work. I tried adding a required validator to the edit item template, and it throws an error. The solution is not that simple unless you use a generic ASP.Net file upload. Probably because of the telerik controls ability to upload multiple files.

[robertw102]

Are you adding a RequiredFieldValidator control or a CustomValidator control? I don't think a RequiredFieldValidator control will work on RadUpload. I always use CustomValidator controls on RadUpload and I create a client-side javascript check to make sure it contains a file to upload.