protected void button1_Click(object sender, EventArgs e)
        {
            BorrowBL a = new BorrowBL();
            BorrowDA b = new BorrowDA();
            int code = 0;
            try
            {
                code = int.Parse(textBox1.Text);
            }
            catch (Exception ex)
            {

                Label1.Text = "Please enter a corect book number!";
                Label1.Visible = true;
                return;
            }

            bool test = a.checkMember(code);
            if (!test)
            {
                Label1.Text = "Don't have this member in Database!";
                Label1.Visible = true;
                return;
            }

            else
            {
                DataSet ds = b.SelectDS(code);
                DataView dv = new DataView(ds.Tables[0]);
                textBox2.Text = b.getName(code);
                textBox1.Enabled = false;
                button1.Enabled = false;
                textBox3.Enabled = true;
                button2.Enabled = true;
                Label1.Visible = false;
                FillBorrow(code);
            }
        }
 private void FillBorrow(int a)
 {
     BorrowDA b = new BorrowDA();
     DataSet ds = b.SelectDS(a);
     DataView dv = new DataView(ds.Tables[0]);
     gvBorrow.DataSource = dv;
     gvBorrow.DataBind();
     totalBr.Text = gvBorrow.Rows.Count.ToString();
 }