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//For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
/// <summary>
/// Compares and finds metadata difference of two files 
/// </summary>
/// <param name="filePath1">First file path</param>
/// <param name="filePath2">Second file path</param>
public static void CompareFilesMetadata(string filePath1, string filePath2)
{
    try
    {
        // path to the document
        filePath1 = Common.MapSourceFilePath(filePath1);

        // path to the compared document
        filePath2 = Common.MapSourceFilePath(filePath2);

        // get diffences between metadata
        MetadataPropertyCollection diffenceProperties = MetadataUtility.CompareDoc(filePath1, filePath2);

        // go through collection and show differences
        foreach (MetadataProperty property in diffenceProperties)
        {
            Console.WriteLine("Property = {0}, value = {1}", property.Name, property.Value);
        }
    }
    catch (Exception exp)
    {
        Console.WriteLine(exp.Message);
    }
}