[RESOLVED] Query not execute when I trap Button click

[dr_aybyd]

QUery not executed when I use a Button Click on my MessageBox.

Here is my code

con = new SqlConnection();
            con.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\MyRecords\\pData.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
            SqlCommand nonqueryCommand = con.CreateCommand();
            string delID = label8.Text;
            switch (MessageBox.Show("Delete Client: " + delID + " " + label9.Text + ", " + label10.Text + " ", "Warning", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning))
            {
                case DialogResult.Yes:
                    con.Open();
                    nonqueryCommand.CommandText = "DELETE FROM tblClients WHERE p_ID='" + delID + "'";
                    nonqueryCommand.ExecuteNonQuery();
                    con.Close();
                    break;
                case DialogResult.No:
                    // "No" processing
                    break;
            }

Also I need to trap if string delID holds a value.