asp.net - A WHERE statement in my SqlDataSource causes invalid character exception (ORA-00911), why? -

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i'm using oracle developer tools , generated select command is: 

selectcommand = "select "firstname" "users" ("username" = ?)">`

then removed " , replaced them single quote: '.

then error (mentioned in title).

any suggestions how can make work?

you should using this

select firstname users username='%?'

just replace value in condition live values. note down syntax of sql


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