LINQ : Left Outer, Inner Join on DataTable

Apply Inner joins and Outer joins using LINQ on Datatables.
Using Extension method.
Handling null values in LINQ expn while applying joins.

IEnumerable Tricks 1 : DataTable and DataColumn

Tricks of TSQL type subqueries with IEnymerable extention methods OfType and Cast 

and using String function Join().

Simplify logic, to use sub queries in business layer's managed code your component

over Datatables  and datasets.

C# Type Casting: Prefix Vs. ‘as’ casting

Type casting in C#.
Prefix Vs. ‘as’ casting
Little bit over Boxing and unboxing.

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In VS 2005, you might bump into a problem where you won't be able to debug your web application.
Your break point won't hit, even if your are able to attach debugger to the worker process.
Following is a resolution for such problem
Well, i don't guarantee it will work for you. But it worked for me...