Error while delete file on server

See more:

C#

ASP.NET

server

file

File-Upload

, +

I want delete a file but an error occured please help me.
==============================
The process cannot access the file 'D:\My Project\AzadUniv\New\12\GUI\Upload\NewsImage\5564868769930125853-Image' because it is being used by another process.
==============================

string ImagePath = Server.MapPath(".")+"\\Upload\\NewsImage\\" + Utility.GenerateGUID() + "-Image";
            if (fuImage.PostedFile != null)
            {
                fuImage.PostedFile.SaveAs(ImagePath);
                fuImage.Dispose();
                string d = Utility.GetThumbnailImage(ImagePath, 100, 100,true);

            }



  public static string GetThumbnailImage(string path,int x,int y,bool DeleteAfterSave)
        {

                // Create the in-memory bitmap where you will draw the image.
                Bitmap image = new Bitmap(x, y);
                Graphics g = Graphics.FromImage(image);

                // Load the file data.
                System.Drawing.Image thumbnail =
                System.Drawing.Image.FromFile(path);

                // Draw the thumbnail.
                g.DrawImage(thumbnail, 0, 0, x, y);

                // Render the image.
                string NewPath = path +"-small.jpg";
               image.Save(NewPath, ImageFormat.Jpeg);
                
                g.Dispose();
                image.Dispose();
                if (DeleteAfterSave == true)
                {
                    System.IO.File.Delete(path);
                }
                return path;
            }