Save changes to database in windows form C#

private string sConnectionString = ConfigurationSettings.AppSettings["ScreenDB"];

        public void vDeleteUser(string sTagID)
        {
            SqlConnection cnConnection = new SqlConnection(sConnectionString);
            try
            {
                if (cnConnection.State == ConnectionState.Closed)//check the connection
                {
                    //  Open the connection
                    cnConnection.Open();
                }
                //
                //Use the connection
                //

                SqlCommand cmdDelete = new SqlCommand();
                cmdDelete = new SqlCommand("SP_DeleteUser", cnConnection);
                cmdDelete.CommandType = CommandType.StoredProcedure;
                //if (!sTagID.Equals(string.Empty))
                //{
                   cmdDelete.Parameters.Add("@TagID", SqlDbType.VarChar).Value = sTagID;
                //}
                // Get query results
                   
                cmdDelete.ExecuteNonQuery();
            }//end try
            //To handle SQl exception
            catch (SqlException ex)
            {
                MessageBox.Show(ex.ToString());
                           }
            //To handle any type of exception
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
               
            }
            finally
            {
                //cnConnection.Close();
            }

        }

private void button1_Click(object sender, EventArgs e)
        {
           ManageUser oUser = new ManageUser();
           oUser.vDeleteUser("11221");
           
        }