VSTO PowerPoint 2013 load BuildInDocumentProperties

sample.cs

/**
* this is only a snippet and it will cause errors during the compiling
* For more information see
* https://msdn.microsoft.com/en-us/library/microsoft.office.core.documentproperty.aspx
/

// put this into using area
using Office = Microsoft.Office.Core;


// the following code has to be add into a function
# region get/set property value for subject
Presentation pres = Globals.PowerPointInterpreterAddIn.Application.ActivePresentation;
Office.DocumentProperties properties = (Office.DocumentProperties)pres.BuiltInDocumentProperties; //get all properties
Office.DocumentProperty prop = properties["Subject"]; // get subject of presentation

// if properties is empty add subject text
if (prop.Value == null || prop.Value.ToString() == String.Empty) 
{
  // set the value of the property
  prop.Value = getSubject(); //ToDo implement function getSubject()
}

// save presentation is necessary to keep the set subject
pres.Save

# endregion