I am doing the following:
While i <> 0
i = NWStream.Read(bytesToRead, n, 1)'bytesToRead is a ByteArray
n += 1

I have a web service which accepts some data and stores that data in the
database. My question is should this web service talk directly to the data
access layer (DAL), which populates the database or should there be an extra
layer between web service and the DAL? If there should be ...

sorry that i jump on at the end of the thread -
but isn't this the same as setting the credentials on the proxy`?
like proxy.Credentials = new NetCredentials("user", "pass") ?
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aspnet is the default - you don't have to do anything for that.
regarding ssl
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secmod/html/sec
mod30.asp
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I?ve developed a webservice, but now, how can install it in other computer?
thanks

How do I install my web service into my production web server so that it is
not available publicly but will still be available for my local web pages
that use it?  My references are for localhost but I don't believe this will
work once installed.   I have never moved a web service ...

I'm trying to figure out if it's possible to create an object in a
webservice, return it (the object / representation of an object) to a
client, make modifications on the client and push the changes back to the
webservice?

the account under which the asp.net worker process is running has to have NTFS rights to the files/directories you are writing
under iis5/5.1 this is usually a account called ASPNET
under IIS6 you can configure that using app pools (the default is Network Service)
IIS ...

I try to call a logon webservice method with 3 parameters that are
strings.
the return value should be a xml string including all information on a
user object. When I execute the web service from visual studio test

you are right - Windows needs the password in plaintext to impersonate a user (having to call LogonUser, which requires a password). Thinking about it - it is the only way Windows can do it.
So if you want to use the Windows infrastructure that's already there you have to ...

     Building Real World SOAP Messaging Applications using WSE 2.0 (Part 1)
     by D. Venkatesh Prasad

I'm cross posting from mscom.webservices.general as I have received no answer
there:
There has been a number of recent posts requesting how to satisfactorily
enable BASIC authorization at the HTTP level but as yet no fully useful

I'd like to send invoice information from client program to web service and
then transfer it to xml-file there. The best way to do this could be writing
all the information in xml-format but to send it as a string. But then how
can I create an xml-file out of this string easily? ...

I have created a webservice, it is used by a webpage. The first time I
connect to the page, the connection is very slow, it takes like 6 seconds to
validate the user, I am working on my machine debuging. But it is only the
first time, every other webservice used during the ...

I use my Webservice in IE : http://localhost/CalcWS/CalcService.asmx
That works well.
Then, in visual Studio.NET :
I rename the name of the WebService-class from the default name 'Service1'