Dropdown list issue binding [Resolved]

I've my drop down list controls Country,State,City

public void FillCountrys()
    {
        dt = ad.fillcountry();
        dropNativeCountry.DataSource = dt;
        dropLivingCountry.DataSource = dt;
        dropNativeCountry.DataTextField = "StateName";
        dropLivingCountry.DataTextField = "StateName";
        dropNativeCountry.DataValueField = "id";
        dropLivingCountry.DataValueField = "id";
        dropNativeCountry.DataBind();
        dropLivingCountry.DataBind();
        dropNativeCountry.Items.Insert(0, new ListItem("Select"));
        dropLivingCountry.Items.Insert(0, new ListItem("Select"));       
    }

While selecting the country i'm unable to get the countryCOde to list the sepcific states

protected void dropNativeCountry_SelectedIndexChanged(object sender, EventArgs e)
    {
        FillStates(Convert.ToInt32(dropNativeCountry.SelectedValue.ToString()));
    }

If i omit these lines from Binding dropNativeCountry it wrks fine

dropNativeCountry.Items.Insert(0, new ListItem("Select"));
        dropLivingCountry.Items.Insert(0, new ListItem("Select"));      

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