private void button4_Click(object sender, EventArgs e)
        {
            ProjectAssignDAO assignDAO = new ProjectAssignDAO();

            try
            {
                bool res = assignDAO.RemoveAssignedUser(Program.bugId, id);

                if (res)
                {
                    assignedUser();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }