if (Page.IsPostBack == false)
        {
            SqlConnection con = new SqlConnection("user id=sa;password=vubrain;database=raghu;data source=vubrain4");
            SqlDataAdapter da = new SqlDataAdapter("select countyr_id,countryname from country_master", con);
            DataSet ds1 = new DataSet();
            da.Fill(ds1, "country_master");
            dd1.DataSource = ds1.Tables["country_master"];
            dd1.DataTextField = "countryname";
            dd1.DataValueField = "countyr_id";
            dd1.DataBind();
        }
    }
    protected void dd1_SelectedIndexChanged(object sender, EventArgs e)
    {
        string countryid;
        countryid = dd1.SelectedValue;
        SqlConnection con = new SqlConnection("user id=sa;password=vubrain;database=raghu;data source=vubrain4");
        SqlDataAdapter da1 = new SqlDataAdapter("SELECT stateid,statename FROM countrystate");
        DataSet ds1 = new DataSet();
        da1.Fill(ds1, "countrystate");
        dd2.DataSource = ds1.Tables["countrystate"];
        dd2.DataTextField = "statename";
        dd2.DataValueField = "stateid";
        dd2.DataBind();
 
 
    }
    protected void dd2_SelectedIndexChanged(object sender, EventArgs e)
    {
        string stateid;
        stateid = dd2.SelectedValue;
 
    }