c# - Select SUM if NULL - UPDATE "0" -

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i have got code selects sum , update result somewhere. issue when there no results found select sum(castka) conditions.

i'm wondering how make exception dbnull if there wasn't found result , update "0" instead. i'm not long programming please me solve out?

thank time.

private void btn_zavri_click(object sender, eventargs e)     {         try         {              spojeni.close();             sqlcommand sc2 = new sqlcommand("select sum(castka) sumcastka kliplat akce='" + zakce.text + "' , rocnik='" + rocnik + "'", spojeni);             spojeni.open();             int vysledek2 = convert.toint32(sc2.executescalar());             sqlcommand sc3 = new sqlcommand("update zajezd set s_prijmy=@s_prijmy akce='" + zakce.text + "' , rocnik='" + rocnik + "'", spojeni);             spojeni.close();             sc3.parameters.addwithvalue("@s_prijmy", vysledek2);             spojeni.open();             sc3.executenonquery();         }         catch (exception ex)         {             messagebox.show("" + ex);         }                 {             spojeni.close();             this.close();         }     }

is want achieve?

select isnull(sum(castka), 0) sumcastka kliplat

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