Near the top of the page, you can see "My Go4Expert", "G4EF Links" etc...

Click on "G4EF Links" and select "Articles and Tutorials". Then appropriate go to the sub-forum under which the article should be posted (for this one, it's Programming -> C#).
Then click on "Submit new article" near the top of the page.

Write your article and hit post.

AND, PLEASE POST YOUR CODE INSIDE CODE-BLOCKS. I did it for you in your first post in this thread.