wpf design

I need help to make decision for making framework for new project.
Project is financing (banking) project. It'll b using .net 3.5 sp1 with sql server 2005.
I want to know what should be best approach for framework? Mean to use LINQ or go with Stored procedure way with 3 tier architecture?
or anything else?

For current financing project the framework is done by one of MVP. He used LINQ to all things.
But we facing problem of w3wp process hang. We cant go for web gardening or farming bcz LINQ objects cnt be serialized to store in Session etc.
Difficult to use Transactions in LINQ. Have to use TransactionScope lead to MSDTC problems etc.

Please give your opinion.

For handy database interface, is it good to use SqldataSources exclusively intead of EntLib functions?

Thanks for any feedback.

Hello guys, I have the following scenario,

1. There is a master business object containing 40 fields
2. 2 separate child business objects
3. If I update a child record, I have to update master's 'Last modify by' status along with 3 or more fields in master
   
4. For this purpose, I don't want to initialize a separate Master class object (as most of the fields are unused/wasted)
5. The 'last modify by' also gets updated if the records in master get updated themselves
   

Currently I have separate business objects for master table, Child 1, Child 2 etc.

How do I control this in my business object design ? Do I break up my master object ? Say I extract last 'modify by ' into a new class, through inheritance or some other way ?

Is there a way that whenever child gets updated I use a 'small' class to update Master status only and whenever the master itself gets updated I do the same.

Problem is that I am having redundancy in my small class (Master class also contains 'Last Modify By ',

What would you advice. Please have your say. Thank you.

Edit  I am using webforms guys.

Greetings - I was referred here by MSDN forums hope this is the right place -  

I have a custom control (:WebControl) that renders web.sitemap in a specific way. While it runs error free and produces the expected result, at Design-Time it complains

Error Creating Control - MyControl  The provider 'AspNetXmlSiteMapProvider' specified for the defaultProvider does not exist in the providers collection.

I have discovered that the error is cause by this line of code:

string div = string.Format("<div class='{0}' id='{1}'>{2}</div>", this.CssClass, this.ID.ToString(), EnumerateNodesRecursive(SiteMap.RootNode, level));

or more specifically, by the reference to SiteMap.RootNode - I am not clear what is missing thoough because I have configured the SiteMapProvider in web.config as this:

<siteMap>
      <providers>
        <clear/>
        <add name="AspNetXmlSiteMapProvider" 
             type="System.Web.XmlSiteMapProvider, System.Web, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" 
             siteMapFile="web.sitemap" 
             securityTrimmingEnabled="true"/>
      </providers>
    </s