Redirect to any website page on DropDownList Selection in ASP.Net

Hello

i have download the article and done some modification on it.

Ref:http://www.aspsnippets.com/Articles/Filter-ASPNet-GridView-using-DropDownList.aspx

you have replace this DropDownList

 <asp:DropDownList ID="ddlCountry" runat="server" OnSelectedIndexChanged="CountryChanged"
                            AutoPostBack="true" AppendDataBoundItems="true">
                            <asp:ListItem Text="ALL" Value="ALL"></asp:ListItem>
                            <asp:ListItem Text="Top 10" Value="10"></asp:ListItem>
                            <asp:ListItem Text="yahoo" Value="yahoo"></asp:ListItem>
                            <asp:ListItem Text="google" Value="google"></asp:ListItem>
                        </asp:DropDownList>

i have kept the Id of DropDownList similar to that article DropdownList.

Now replace this Event

 protected void CountryChanged(object sender, EventArgs e)
    {
        DropDownList ddlCountry = (DropDownList)sender;
        if (ddlCountry.SelectedItem.Text == "yahoo")
        {
            Response.Redirect("http://www.yahoo.com");
        }
        else if (ddlCountry.SelectedItem.Text == "google")
        {
            Response.Redirect("http://www.yahoo.com");
        }
        else
        {
            ViewState["Filter"] = ddlCountry.SelectedValue;
            this.BindGrid();
        }
    }

Thank You.