Extract Microsoft Project Metadata Information from .MPP File in C#. The step by step explanation can be found here: https://kb.aspose.com/tasks/net/how-to-extract-microsoft-project-file-metadata-in-c-sharp/

Extract Microsoft Project Metadata Information from .MPP File in C#.cs

using System;
//Add reference to Aspose.Tasks for .NET API
//Use following namespaces to extract metadata from Micorosoft Project file
using Aspose.Tasks;

namespace ExtractMicrosoftProjectFileMetaData
{
    class Program
    {
        static void Main(string[] args)
        {
            //Set Aspose license before extracting metadata from .MPP Project file
            //using Aspose.Tasks for .NET
            Aspose.Tasks.License AsposeTasksLicense = new Aspose.Tasks.License();
            AsposeTasksLicense.SetLicense(@"c:\asposelicense\license.lic");

            //creating an instance of Project class and loading .MPP file to read metadata
            Project MicrosoftProjectFile = new Project("InputMicrosoftProjectFile.mpp");
            //temporary string variables to hold metadata information
            string ProjectAuthor, 
                   ProjectCategory, 
                   ProjectCompany, 
                   ProjectComments;

            //get each metadata property by property name as below
            ProjectAuthor = MicrosoftProjectFile.Get(Prj.Author);
            ProjectCategory = MicrosoftProjectFile.Get(Prj.Category);
            ProjectCompany = MicrosoftProjectFile.Get(Prj.Company);
            ProjectComments = MicrosoftProjectFile.Get(Prj.Comments);

            //display the metadata information read from the Microsoft Project
            Console.WriteLine("Author:{0}, Catgory:{1}, Company:{2}, Comments:{3}", 
                          ProjectAuthor, ProjectCategory, ProjectCompany, ProjectComments);

        }
    }
}