how to close a file and delete that image file?

[girikassss]

Imagename = objUser.UserID + filename;
                    Imagepath = "D:\\Shop\\ShopMonkey\\Images" + Imagename;
                    FileUpload.SaveAs(Path.Combine(@"D:\ShopMonkey_Web_21-6-12\ShopMonkey\Images", Imagename));

objUser.UploadImagePath = Imagepath;

objUser.UploadImagename = Imagename;
System.Drawing.Image img1 = System.Drawing.Image.FromFile(Imagepath);
System.Drawing.Image bmp1 = img1.GetThumbnailImage(50, 50, null, IntPtr.Zero);
ThumbNailPath = "D:\\ShopMonkey_Web_21-6-12\\ShopMonkey\\ThumbNails" + Imagename;
                    bmp1.Save(Path.Combine(@"D:\ShopMonkey_Web_21-6-12\ShopMonkey\ThumbNails", Imagename));
                    objUser.UploadThumbnailPath = ThumbNailPath;

how to delete the image and thumbnail in other function??(its necessary to close that first r not??? please guide me)


pleasse help me friends??