dropdownlist index changed value - asp.net

Question

I have a problem when I change dropdownlist1 item, The changed item not being accessed on the event of DropDownList1_SelectedIndexChanged.
Here is my code...
namespace My_News.Views.Shared
{
public partial class Master : System.Web.UI.MasterPage
{
SqlDataReader dr;
string user_id = "";
protected void Page_Load(object sender, EventArgs e)
{
/* user login information */
if (Session["status"] != null)
{
Button1.Text = "Logout";
Button2.Visible = true; ;
Button2.Text = Session["name"] as string + "'s Profile";
Button3.Enabled = true;
DropDownList1.Enabled = true;
user_id = Session["reg_id"] as string;
DropDownList1.Items.Clear();
using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Connection_String"].ConnectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandText = "SELECT DISTINCT[news_category] from [news_profile] WHERE [user_id]='" + user_id + "'";
cmd.Connection = connection;
connection.Open();
dr = cmd.ExecuteReader();
while (dr.Read())
{
DropDownList1.Items.Add(dr[0].ToString());
}
connection.Close();
}
}
}
else
{
Button1.Text = "Login";
Button2.Visible = false;
Button3.Enabled = false;
DropDownList1.Enabled = false;
Session.Clear();
}
}
Dropdownnlist index change event...
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Session["news_category"] = DropDownList1.Text;
Session["reload"] = "yes";
Session.Timeout = 10;
Response.Redirect("Default.aspx");
}
}
}
Please help me.

Answer 1

You need to modify your code like this
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
bindDDL();
}
protected void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
string s = ddl.Text;
}
public void bindDDL()
{
DataTable dt = new DataTable("Drop");
dt.Columns.Add("ID", typeof(int));
dt.Columns.Add("Name", typeof(string));
dt.Rows.Add(1, "ABCD");
dt.Rows.Add(2, "EFGH");
ddl.DataSource = dt;
ddl.DataValueField = "ID";
ddl.DataTextField = "Name";
ddl.DataBind();
}