SP Not Firing In Foreach Loop

The foreach loop below runs fine and it sends emails as expected but the SP does not update the Companies table.  Any thoughts?  How do I cause the SP to execute?  

 PROCEDURE newdawn.EmailSentDate
     @CID int
AS
     UPDATE Companies
     SET Companies.LastEmailDate = (GetDate())
     WHERE tblCompanies.C_ID = @CID 
RETURN

foreach (GridViewRow row in GridView3.Rows)
        {
            pstrTo = row.Cells[2].Text;
            CEmail = row.Cells[2].Text;
            CName = row.Cells[3].Text;
            CID = row.Cells[1].Text;
            CState = TextBox1.Text;
            CCity = row.Cells[5].Text;
            CCat = row.Cells[4].Text;
            CCID = row.Cells[0].Text;

            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["localhomeexpoConnectionString2"].ConnectionString);
            SqlCommand cmd = new SqlCommand("EmailSentDate", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@CID", CCID);
                       
            try
            {
                System.String mailServerName = "mail.domain.com";

                               REST of code sends email to email address found in each row ....it all works find but SP above does not fire.