/// <summary>
    /// gets user name from model id
    /// </summary>
    /// <param name="model_id"></param>
    /// <returns></returns>
    private string GetUserName(int model_id)
    {
        int userId = ws.GetCreatorUserId(model_id);

        SqlConnection sqlConnection = new SqlConnection(resources.ResourceManager.GetString("Connection_String"));

        if (sqlConnection.State != System.Data.ConnectionState.Open)
        {
            sqlConnection.Open();
        }

        string     query  = "SELECT username FROM [Users] Where Id = @user_id;";
        SqlCommand sqlCmd = new SqlCommand(query, sqlConnection);

        sqlCmd.Parameters.AddWithValue("@user_id", userId);
        SqlDataReader reader = sqlCmd.ExecuteReader();

        string username = "";

        if (reader.Read())
        {
            username = reader.GetString(0);
        }

        return(username);
    }