Question about caml query with UserID/ parameter (working outside of sharepoint )

Question

I have to develop a custom view. I should take the current user and query it in List1 to obtain owned group names. Then I am supposed to query each group name in a List2 to obtain corresponding users. And In a new custom list view I should display those users..
Let's assume I'm working in a c# class in VS. Below is my initial code to fetche owned groups by the current user.
SPQuery query = new SPQuery();  
query.ViewFields = @"<FieldRef Name='Title'/>";  
query.Query = @"<Where><Eq><FieldRef Name='Title' /><Value Type='Integer'><UserID/></Value></Eq></Where>";  
SPList lstUsers = web.Lists["Users"];  
SPListItemCollection userItems = lstUsers.GetItems(query);  
foreach (SPListItem myitem in userItems)  
{Response.Write(myitem["Title"].ToString());}  
 The "<UserID/>"   parameter in caml query does not work outside...
query.Query = @"<Where><Eq><FieldRef Name='Title' /><Value Type='Integer'><UserID/></Value></Eq></Where>";
How can I obtained the current logged user from outside of sharepoint?
Should I write my code somewhere other then a seperate vs c# class?
I appreciate any idea and suggestions....

Answer 1

If you are quering a User ID of UserField, you need to add LookupId='True'/ to FieldRef
<Eq>
         <FieldRef Name=Owner' LookupId='True'/>
         <Value Type='User' >2</Value>
</Eq>
Thanks, Rocky Fernandes