private void btn_delete_user_Click(object sender, EventArgs e) { string user_name = tb_userName_user.Text.ToString().Trim(); UserControls userControls = new UserControls(); if (isValidString(user_name)) { User user = userControls.SearchUser(user_name, "user"); if (user != null) { bool isDeleted = userControls.DeleteUser(user_name, "user"); if (isDeleted) { LoadUsers(); MessageBox.Show("User Deleted."); } else { MessageBox.Show("User can not be Deleted."); } } else { MessageBox.Show("User Doesn't Exist."); } } else { MessageBox.Show("Enter User Name."); } }