Converting BMP Filepath To An Image For A Picturebox?

I'm Currently using the following code to open up a folder containing Text and Bitmap files only and store them in arrays.

Dim d As New System.IO.DirectoryInfo("C:Documents and Settings" & GetUserName() & "My DocumentsWolfRiderGamesWaterGameMaps")
Dim FileCount As Integer = d.GetFiles.GetUpperBound(0) + 1

[Code]....

What I need is an extra bit at the end that takes the first bitmap file found and puts it in a picturebox called "PicCenter".

I need to have this done through converting its filepath to the image itself.

I will also Need an explaination of how you did it (If its complicated) because i'll need to do it again later.

Im using Visual Studio 2010.

I Know how to do most simple things in VB which usually allows me to do a workaround for something like this, but this one I couldn't.