public static string GetFileName(Guid id)
 {
     using (SqlConnection connection = new SqlConnection(Config.ConnectionString))
     {
         connection.Open();
         using (SqlCommand cmd = new SqlCommand("SELECT fileName FROM Documents WHERE id = @id", connection))
         {
             cmd.CommandTimeout = Config.CommandTimeout;
             cmd.AssignParams("id", id);
             return (string)cmd.ExecuteScalarRetryOnDeadlock();
         }
     }
 }