How to set SOAPUser

hello,
i hope , think question quiet easy answer. since developing server axis java not used authentication via soap in .net.
i want service, created webreference assistent, send specific user , password in soap header.
its no use me use defaultcredentials or other domainusers. neet set these 2 variable hand.

can give me hint how have modify following constructer use hardcoded user , password?

       /// <remarks/>
        public simplepackageserviceservice() {
            this.url = global::windowsapplication1.properties.settings.default.windowsapplication1_localhost_simplepackageserviceservice;
            if ((this.islocalfilesystemwebservice(this.url) == true)) {
                this.usedefaultcredentials = true;
                this.usedefaultcredentialssetexplicitly = false;
            }
            else {
                this.usedefaultcredentialssetexplicitly = true;
            }
        }

i using wse 2.

thanks,
       alexander

does no 1 have idea how set tags in soap header?
i sure there must 1 reason soap 1.2 standard.

setting
this.credentials = new networkcredentials("user","pw");

did not make it.

thx,
   alexander

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