Custom properties are not updated for the word via openXML - c#-3.0

Question

I am trying to update custom properties of word document thru Open XML programming but it seems the updated properties are not getting saved properly for the word document. So when I opening document after successful execution of the update custom property code, I am getting the message box which is "This document contains field that may refer to other files; Do you want to update the fields in the Document?" If I am pressing 'NO' button then all the update properties would not be saved to the document. If we are going for yes option then it will update properties but I need to save the properties explicitly. Please suggest to save properties to the document without getting confirmation message or corrupting the document. :)
the code snippet is given as below,
public void SetCustomValue(
WordprocessingDocument document, string propname, string aValue)
{
CustomFilePropertiesPart oDocCustomProps = document.CustomFilePropertiesPart;
Properties props = oDocCustomProps.Properties;
if (props != null)
{
//logger.Debug("props is not null");
foreach (var prop in props.Elements<CustomDocumentProperty>())
{
if (prop != null && prop.Name == propname)
{
//logger.Debug("Setting Property: " + prop.Name + " to value: " + aValue);
prop.Remove();
var newProp = new CustomDocumentProperty();
newProp.FormatId = "{D5CDD505-2E9C-101B-9397-08002B2CF9AE}";
newProp.Name = prop.Name;
VTLPWSTR vTLPWSTR1 = new VTLPWSTR();
vTLPWSTR1.Text = aValue;
newProp.Append(vTLPWSTR1);
props.AppendChild(newProp);
props.Save();
}
}
int pid = 2;
foreach (CustomDocumentProperty item in props)
{
item.PropertyId = pid++;
}
props.Save();
}
}
I am using .Net framework 3.5 with Open XML SDK 2.0 and Office 2013.

Answer 1

Try this one
var CustomeProperties = xmlDOc.CustomFilePropertiesPart.Properties;
foreach (CustomDocumentProperty customeProperty in CustomeProperties)
{
if (customeProperty.Name == "DocumentName")
{
customeProperty.VTLPWSTR = new VTLPWSTR("My Custom Name");
}
else if (customeProperty.Name == "DocumentID")
{
customeProperty.VTLPWSTR = new VTLPWSTR("FNP.SMS.IQC");
}
else if (customeProperty.Name == "DocumentLastUpdate")
{
customeProperty.VTLPWSTR = new VTLPWSTR(DateTime.Now.ToShortDateString());
}
}
//Open Word Setting File
DocumentSettingsPart settingsPart = xmlDOc.MainDocumentPart.GetPartsOfType<DocumentSettingsPart>().First();
//Update Fields
UpdateFieldsOnOpen updateFields = new UpdateFieldsOnOpen();
updateFields.Val = new OnOffValue(true);
settingsPart.Settings.PrependChild<UpdateFieldsOnOpen>(updateFields);
settingsPart.Settings.Save();
you have to update your document fields on open.