c# - SQL Error: ORA-00904: invalid identifier - Send to oracle -


what wrong query im sending oracle?

this code:

manager.insert("update wedstrijd set uitslag ='" + uitslag + "'  wedstrijdnr =" + nummer2);

this being send: 

update wedstrijd set uitslag = '21-2' wedstrijdnr = 14;

but how can change to?

i need query:

update wedstrijd set "uitslag" = '21-2'  "wedstrijdnr" = 14;

so problem upper , lower case, why need column names in quotes? if should quote names in query string:

manager.insert("update wedstrijd set \"uitslag\" = '" + uitslag + "' \"wedstrijdnr\" = " + nummer2);

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