Update Custom Variables using open Xml

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C#5.0

OpenXML

Hi..

i have Code to Update Custom Variables using OpenXml SDK in C#
to Update custom variables in document i have added

using (_objDoc = WordprocessingDocument.Open(szFileName, true))
{
   DocumentSettingsPart settingsPart =    _objDoc.MainDocumentPart.GetPartsOfType<DocumentSettingsPart>().First();
  UpdateFieldsOnOpen updateFields = new UpdateFieldsOnOpen();
  updateFields.Val = new DocumentFormat.OpenXml.OnOffValue(true);
  settingsPart.Settings.PrependChild<UpdateFieldsOnOpen>(updateFields);
  settingsPart.Settings.Save();
}

when i open world document i'm getting following prompt.
"This document contains fields that may refer to other files. Do you want to update the fields in this document?"

With Options
        .UpdateFieldsAtPrint = True
        .UpdateLinksAtPrint = True
    End With
    For Each l_section In ActiveDocument.Sections
        For Each l_headerfooter In l_section.Headers
        l_headerfooter.Range.Fields.Update
    Next l_headerfooter
    For Each l_headerfooter In l_section.Footers
        l_headerfooter.Range.Fields.Update
    Next l_headerfooter
    Next l_section
    ActiveDocument.Fields.Update

i have used above Macro to update Custom variable on client machine but it's not a convenient option for me as i need to updated macro on each machine.

how i can avoid/hide this prompt .