How to delete a folder which is not empty and used by another process ?

Question

Hi, I have a problem on this code bellow, here I'm trying to Delete a Folder (Album ) Which has so many pictures. I have set the Album from image from a different folder (tempFolder) and i have used a third party dll which just take the ImageFolderPath to show the images on a thikbox popup. My problem is this when ever I'm trying to delete a Album its throing an exception as 'File can not be delete it's currently used by another process'. So Please help me how to delete a folder which is used by another process or not empty..

string SavePath = Server.MapPath("~/" + Convert.ToString(iPlayConstant._USERTYPE) + "/Gallery/" + Convert.ToString(iPlayConstant._USERID) + "/" + Convert.ToString(e.CommandArgument) + "/");

        DirectoryInfo di = new DirectoryInfo(SavePath); 
          try
    {
        if (e.CommandName == "Delete Album")
        {
            if (di.Exists)
            {
                FileInfo[] fi = di.GetFiles();

                for (int i = 0; i < fi.Length; i++)
                {
                    try
                    {
                        fi[i].Delete();
                    }
                    catch (Exception ex1) { }
                }

                di.Delete();
            }
}

catch (Exception ex) { }

Thanks Bishnu