private void search1_TextChanged(object sender, EventArgs e)
        {
            String keywords = search1.Text;

            if (keywords != null)
            {
                DataTable dt = dal.Search(keywords);
                dataGridView1.DataSource = dt;
            }
            else
            {
                DataTable dt = dal.Select();
                dataGridView1.DataSource = dt;
            }
        }
        private void txtsearch_TextChanged(object sender, EventArgs e)
        {
            //Get Keyword from Text box
            string keyword = txtsearch.Text;

            //Check if the keywords has value or not
            if (keyword != null)
            {
                //Show user based on keywords
                DataTable dt = dal.Search(keyword);
                dgvusers.DataSource = dt;
            }
            else
            {
                //show all users from the database
                DataTable dt = dal.select();
                dgvusers.DataSource = dt;
            }
        }