C# - Label As Dynamic Navigation

I Made label to had value from database and linked it . but the problem was it had only one value and i want it keep value when navigation thought site as.

x>y>z>....
this is my code
<
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();
cmd.Connection = conn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "Navcategory";
cmd.Parameters.Add(Parameter.NewInt("@Category_Id", Request.QueryString["Category_Id"]));
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
LblNavigaton.Visible = true;
LblNavigaton.Text = dr[i].ToString();
NavHref.HRef = "ListView.aspx?Category_Id=" + Request.QueryString["Category_Id"] + "";
}
}
}
else if (Request.QueryString["ProductCategory_Id"] != null)
{
Banar.ImageUrl = "Handlers/ProCatBanner.ashx?ProductCategory_Id=" + Request.QueryString["ProductCategory_Id"] + "";
using
(SqlConnection conn = Connection.GetConnection())
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "NavProductcategory";
cmd.Parameters.Add(Parameter.NewInt("@ProductCategory_Id", Request.QueryString["ProductCategory_Id"]));
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
LblNavigaton.Visible = true;
LblNavigaton.Text = dr["Name"].ToString();
NavHref.HRef = "ListView.aspx?ProductCategory_Id=" + Request.QueryString["ProductCategory_Id"] + "";
}
else
{
LblNavigaton.Visible = true;
LblNavigaton.Text = Page.Title;
}
}