aspx c# extra semi colon appear with inline if statement on onclick event

first time here.

I'm having trouble with c# inline if statement in aspx page, i'm trying to call a different onClick method depending if my Parent has Child or not, however, for some reason, it adds a ; in the code but the fonction is never called, however, with the same if statment in a text field, everything shoes fine without any semicolon.

any idea why?

here are both OnClick and text code snippet

OnClick='<%#(int)Eval("nbChild") != 0 ? "Expend" : "AddSub" %>'

Text='<%#(int)Eval("nbChild")!=0 ? "Expend":"AddSub" %>'