You should make sure that the file path passing to delete from the server in asp.net c#. This following code is to delete the record from database and also from the folder path of the server.
Picture picture = db.Pictures.Find(id);
if ((picture != null))
{
if (System.IO.File.Exists(Server.MapPath(picture.Path)))
{
System.IO.File.Delete(Server.MapPath(picture.Path));
}
}
db.Pictures.Remove(picture);
db.SaveChanges();