thanks! everything works fine, but there`s another problem my program looks like client windows apllication and sever xml web service. everything is ok on local machine. then i deploy web service on a host. and from now on client doesn`t want to work (i made a proper web reference) - it looks for a file "messages.xml" (which is called by web server) in c:\windows\......., not at the host public bool Send(int num1, int num2, DateTime date, string text) { DataSet ds=new DataSet(); ds.ReadXml("messages.xml"); ....