Get Custom Properties of Referenced Part (C#)

//----------------------------------------------------
// Preconditions:
// 1. Open a part that contains a referenced part
//    with a custom property and a value.
// 2. Open the referenced part.
// 3. Switch back to the part opened in step 1.
// 4. In the macro, replace Property_Name with the name of
//    the referenced part's custom property.
//
// Postconditions: The custom property data
// is printed to the Immediate window.
//---------------------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System;
using System.Diagnostics;

namespace Get4CustomPropertyManagerCSharp.csproj
{
    partial class SolidWorksMacro
    {

        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            ModelDocExtension swModelDocExt = default(ModelDocExtension);
            CustomPropertyManager swCustProp = default(CustomPropertyManager);
            string val = "";
            string valout = "";
            bool status;

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swModelDocExt = swModel.Extension;

            // Get the custom property data
            swCustProp = swModelDocExt.get_CustomPropertyManager("");
            status = swCustProp.Get4("Property_Name", false, out val, out valout);

            Debug.Print("Value:                    " + val);
            Debug.Print("Evaluated value:          " + valout);
            Debug.Print("Up-to-date data:          " + status);

        }

        /// <summary>
        /// The SldWorks swApp variable is pre-assigned for you.
        /// </summary>

        public SldWorks swApp;

    }
}