Error: There is no row at position 0

Question

HI, i am currently working on a project, when i run the program, there is an error showing on button click event It says this:

 

Exception Details: System.IndexOutOfRangeException: There is no row at position 0.

protected void btnAddCart_Click(object sender, EventArgs e)
{
      if (Session["Mycart"] == null)
      {
          ShoppingCart Mycart = new ShoppingCart();
         Session["Mycart"] = Mycart;
      }
      string Id = Request.QueryString["BookID"];
      Mycart =(ShoppingCart)Session["New"];
      String Query = "select * from BookData where BookID= '" + Id + "'";
      SqlCommand cmd = new SqlCommand(Query, con);
      SqlDataAdapter Da = new SqlDataAdapter(cmd);
      DataTable Dt = new DataTable();
      Da.Fill(Dt);
      DataRow row = Dt.Rows[0];
      Mycart.Insert(new CartItem(Int32.Parse(Id),
                              row["name"].ToString(),
                              row["author"].ToString(),
                              int.Parse(row["isbn"].ToString()),
                              row["language"].ToString(),
                              row["publisher"].ToString(),
                              row["Summary"].ToString(),
                              Double.Parse(row["price"].ToString()),
                              1)
                              );
}

Please reply fast, its very urgent

 

thank you.