How can I use a public variable on aspx page

public int currentProject=0; => this will be post from the aspx.cs to aspx
and this command will work with this variable
SelectCommand='SELECT Y.KUL_AD, Y.KUL_SA, X.YORUMICERIK, X.TARIH FROM KULLANICILAR AS Y INNER JOIN YORUM AS X ON Y.KUL_ID = X.YAZAR_ID and X.PROJE_ID=<%currentProject%>'><DeleteParameters><asp:Parameter Name="YORUM_ID" Type="Int32"