How to store/save the store procedure from rich text box to SQL server

if (rtbSPQuery.Text != "")
            {
                string execQuery = rtbSPQuery.Text;
                SqlConnection con = new SqlConnection(ProjectConnection.conStr);

                try
                {
                    con.Open();
                    SqlCommand comSaveSP = new SqlCommand("exec"+execQuery, con);
                    comSaveSP.ExecuteNonQuery();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
                finally
                {
                    con.Close();
                }