C # Does not recognize characters after space

Always escape any user-entered text before submitting it to a web handler. (And, if you’re using these parameters to populate a high score table, I really hope you’re using a stored procedure rather than dynamically constructed SQL at the other end)

string URL = WWW.EscapeURL("http://...." + txt01Codigo.text + "&NOM=" + txt02Nombre.text);
WWW connection = new WWW(URL);

%20 for spaces