problem in calling dropdown ....through if-else

Question

i want to do is if drop down list selected value will be "electrical" then page redirect to the elec.aspx.

protected void apply_Click(object sender, EventArgs e)

    {

        string DEPT = "";

        library lib = new library();

        

        string strdepartment_name = ddrdepartment.SelectedValue.Trim();

        DataTable dtdeptname = new DataTable();

        dtdeptname = lib.Getdeptname(strdepartment_name);

        DEPT = lib.Getdeptname(strdepartment_name);

        if (DEPT == "CIVIL")

        {

            Response.Redirect("CIVIL.aspx");

        }

        else if (DEPT == "ELECTRICAL")

        {

            Response.Redirect("ELEC.aspx");

        }

        else

        {

            Response.Redirect("MECH.aspx");

        }

}

please someone help me ...i m not getting properly....