State/Province/Country Issue MVC

Hi:

I have a website with clients from US and Canada.  I've updated the code to MVC and am trying to figure out how have the dropdown for provinces-states populated with the appropriate data depending on the country that was chosen.  

In my forms program, this is what fired when the Country dropdown box changed:

 private void PopulateState_Provinces(string Country_Code)
        {
            if (Country_Code == "US")
            {
                lblProvince.Text = "State:Country";
                lblPostalCode.Text = "Zip Code";
            }
            else
            {
                lblProvince.Text = "Province:Country";
                lblPostalCode.Text = "Postal Code";
            }


            DataTable dtProvinces = DataAccess.Provinces_GetAll(Country_Code);
            drpProv_Code.DataSource = dtProvinces;
            drpProv_Code.DataValueField = "Prov_Code";
            drpProv_Code.DataTextField = "ListName";
            drpProv_Code.DataBind();
        }

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Any suggestions greatly appreciated!

RBS