C# resize image and save

using System;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
namespace PSexample
{
    class Program
    {
        static void Main(string[] args)
        {
            dynamic app = Activator.CreateInstance(Type.GetTypeFromProgID("Photoshop.Application"));
            Regex reg = new Regex(@"(?i)\.(jpg|jpeg)$"); //select jpg files only    
            //change folder to suit          
                var files = Directory.GetFiles(@"d:/a test", "*.*").Where(path => reg.IsMatch(path)).ToList();
            app.Preferences.RulerUnits = 1; //pixels
            foreach (string file in files)
            {
                app.open(file);
                string Name = app.ActiveDocument.Name;
                //resize to a width of 300 pixels with constraint
                app.ActiveDocument.ResizeImage(300 /*width*/, null/*height*/, 300/*resolution*/, 5/* ResampleMethod.BICUBICSHARPER*/);
                string saveFile = @"c:/utils/"+ Name;
                dynamic jpgOpts = Activator.CreateInstance(Type.GetTypeFromProgID("Photoshop.JPEGSaveOptions"));
                jpgOpts.embedColorProfile = true;
                jpgOpts.formatOptions = 1 /* FormatOptions.STANDARDBASELINE*/;
                jpgOpts.matte = 1 /*MatteType.NONE*/;
                jpgOpts.quality = 12; //1-12
                app.ActiveDocument.SaveAs(saveFile, jpgOpts, true, 2); //2= lowercase
                app.ActiveDocument.Close(2); /* Close document */
            }
        }
    }
}