public static Boolean updateRequest(String _VUserName, DateTime newToDate)
{
    SqlConnection conn = getConnection();
    SqlCommand command = new SqlCommand();
    command.CommandText = "UPDATE Requests SET [To] = @ToDate FROM Requests INNER JOIN "+
                  "VUsers ON Requests.UserRef = VUsers.VUserID WHERE (VUsers.VUserName = @VUserName)";

    command.Parameters.AddWithValue("@ToDate", newToDate);
    command.Parameters.AddWithValue("@VUserName", _VUserName);

    conn.Open();
    try
    {
        command.ExecuteNonQuery();
        return true;

    }
    catch (Exception)
    {
        return false;

    }
    conn.Close();
}