If you have ever used Windows Presentation Foundation (WPF) then you might have been impressed by the binding features of it.

Part one of this tutorial will show how to bind properties of the same type while the second one will also anlyse type conversion.

Using data binding you can synchronize object properties. The source of the binding is the object or property that is changing the value and the destination is the one who receives it (the new value).

There are two types of binding:

• one way binding - there is only one source that updates the information and as many destinations who receive the update.
• two way binding - every binding element can update and can receive updates so there is no distinction between source and destination.

continue reading "Binding in WinForms like in WPF Part 1"

Technorati Tags: C#, Data Binding, Visual Studio

I was curios how expensive is a cross domain operation so I have made a test.

The test procedure is simple. Perform a number of cross-domain and non cross-domain operations (get the value of NextNumber() from same domain and from another domain) and measure the time elapsed. For each value I have runned the application 3 times, recorded the time (in milliseconds) and created the mean of this three.

For this I’ve created a Console Application containing two classes, the main class and “NumberClass” which has a method that returns the next long. The code for this two is below:

NumberClass:

//MarshalByRefObject is used because this object will cross domain boundary
class NumberClass:MarshalByRefObject
{
    public ulong number = 0;

    public ulong NextNumber()
    {
        return number++;
    }
}

The Main method from the main class:

continue reading "How expensive are cross-domain operations?"

Technorati Tags: .NET Framework, AppDomain, Cross domain, Microsoft, Programming, Visual Studio

Reflection is the process by which a computer program can observe and modify its own structure and behavior. The programming paradigm driven by reflection is called reflective programming. [Wikipedia]

Working a few days ago on a plugin architecture on .NET Framework I’ve found something very interesting. The method System.Reflection.EventInfo.AddEventHandler does late-binding. You’ll probably say “so what?”. Let’s see the problem with an example:

Using Visual Studio 2005/2008, create two C# projects (a windows forms application project and a class library one). Rename the class from the class library project to “TestClass.cs”.

continue reading "EventInfo.AddEventHandler - bug or not?"

Technorati Tags: .NET Framework, Bug, EventInfo.AddEventHandler, Microsoft, Programming, Visual Studio