Get Items from limited list by providing username and password - C#

I'm using the code at the following link in order to get items from SharePoint list,
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.list.getitems.aspx
I have a SharePoint list that limited to certain users.
How can I provide by this code (or else) a username and password and log in as a different user who has access to this SharePoint list and get its items?
Thanks!

Sorry, previous post didn't see you were using client object model.
Service.Credentials = (create new credentials passing username and password)
ICredentials credentials = new NetworkCredential("Joe",SecurelyStoredPassword,"mydomain");
math.Credentials = credentials
Thanks!
Actually, my full question already posted here:
http: //sharepoint.stackexchange.com/questions/84917/c-why-impersonation-is-expired-while-clientcontext-executequery-is-performe
but I was unable to post it here as a new user (images, links, lenght ...) even the link above I was need to insert spaces after "http:" to be able to post it.
Anyway, I don't know "client object model." am I using it?
You mentioned "Service.Credentials", What do you mean "Service"?

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as well on that list of 700000+ items.
Thanks anyway though

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"Neil Smithline" <[email protected]> wrote in message
news:[email protected]..
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Michel Crichton wrote:
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Message was edited by:
[email protected]

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Get Items from limited list by providing username and password - C#

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