C# - Navigation Bar From Database

i want to make navigation bar with items i will select them as (category,Product,....) So i made stored to get them throught paramater will pass it,s value from query string as.

ALTER Proc Navcategory
(
@Category_Id Int
)
As
Select Distinct Categories.Category,Categories.Category_Id
From Categories
Where Category_Id=@Category_Id
and i mentioned in cs
as
if (Request.QueryString["Category_Id"] != null)
{
Banar.ImageUrl = "Handlers/Banner.ashx?Category_Id=" + Request.QueryString["Category_Id"] + "";
using
(SqlConnection conn = Connection.GetConnection())
{
SqlCommand cmd = new SqlCommand();........................