protected void btnAdd_Click(object sender, EventArgs e)
        {
            string title   = txtTitle.Text;
            double price   = Convert.ToDouble(txtPrice.Text);
            double special = Convert.ToDouble(txtSpecial.Text);

            Web webObj = new Web();

            webObj.Title   = title;
            webObj.Price   = price;
            webObj.Special = special;

            Response.Write("<script>alert('Book Added Successfully');</script>");
            AdminGridView.DataSource = webObj.AddBookAdmin();
            AdminGridView.DataBind();
        }