Visual Basic .NET

In my tutorial “How to Pass Value from One Form to another Form” I discussed how the other form received a value by using a Public Variable.

There are so many discussions on the Internet that argues whether Public Variable is a good programming practice compare to Property. Well, IMHO public variable is an option for simplicity. You do not need to waste line of code just to get the same result.

This sample program demonstrates how to get youtube video thumbnails using VB 2008. Just enter the video URL at the textbox then using simple string manipulation, the program extracts the video id from the URL. The video id is the unique identifier of the video generated by youtube when the video was uploaded. This video id is necessary for retrieving the thumbnails for the videos.

[inline:RemoveHandler.jpg=How to Prevent Events to Fire More Than Once]

If you are new to VB.NET most likely you encounter a problem with events like TextChanged or ValueChanged events.

In VB 6.0, change event is not fired when changing a value programmatically. However, in the .NET version this has been changed.

In order to avoid this problem you need to call a RemoveHandler Statement.

The following code is an example of this.