Did you ever need to convert List(T1) to List(T2)? One example might be when implementing an interface. you might need to expose a collection of other interfaces (or maybe the same interface), But you usually hold the concrete type implementing the interface in the collection. Lets look at the following example:

List<T>.Find() returns the first element found that matches a given criteria. So lets say we have List<int> and we use the Find method on it. What will be the returned value? If a number in the list matches the criteria it will be returned, but what if not? what does the variable zero contains after executing this code:

List<int> listOfInts = new List<int>(new int[] { 1,2,3,4,5,6,7,8,9});
int zero = listOfInts.Find(
    delegate(int i)
    {
        return i == 0;
    });

It has the value of…

ASP.NET provides mechanisms for storing information for a single user session or across multiple sessions. This is done using the HttpSessionState and HttpApplicationState classes. The Page class has Application and Session attributes to provide access to current objects. The simple way to access them is as following:

if (Session["FirstName"] == null)
{
    LabelFirstName.Text = “FirstName”;
}
else
{
    LabelFirstName.Text = (string)Session["FirstName"];
}
if (Session["LastName"] == null)
{
    LabelLastName.Text = “LastName”;
}
else
{
    LabelLastName.Text = (string)Session["LastName"];
}

I’ve read about jQuery in this great post Five recommendations for starting a startup with ASP.NET and wanted to play with it and see
how easy it is to call a WebMethod from
sQuery. I Started by reading some of the great Tutorials and downloaded the code from here.
I Created a test web project, copied the jQuery [...]

Linq to xml provides an easy query interface for XML files. In the following example I will demonstrate how to use it for reading and writing data from/to xml file, using the file for persistency maintaining a list of objects. This can be used for storing application settings, storing persistent objects or any other data [...]

Serialization is the process of saving an object onto a storage medium (such as a file, or a memory buffer) or transmiting it across a network connection link in binary form.
The .NET Framework provides an easy-to-use serialization mechanism by using the [Serializable] attribute. If so why do we need the ISerializable interface? Lets compare to see [...]

LINQ to SQL maps the relational database into an object model, and when the program runs the queries in the object model are translated into SQL. SQL contains Aggregate functions like SUM, AVG, MIN, MAX and more. Lets see how this functionality can be implemented using LINQ Enumerable standard aggregation operators. You can also create [...]

We use collections all the time. Many times we have to expose them to users of our classes. Lets look at this simple tree node class:
class TreeNode
{
private List<TreeNode> children = new List<TreeNode>();

public IList<TreeNode> Children
{
[...]

Finding a good and free domain is not an easy task, and might be a real time consuming. To make it much more efficient and fun, why don’t you do it the web 2.0 way? check out ajaxwhois.com. you can select the preferred extensions and just type in the name you want to check without [...]

We wanted to check whether WPF data binding is thread safe, and made a little test (using .NET 3.5). Lets look at the Worker class, which has one property - Money, and is making money in a multithreaded way :) - creating 100 threads and increasing the “Money” property from each one of them:
class Worker : INotifyPropertyChanged [...]