How to Show image thumbnail and delete option in vb.net winodws application

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VB

I am Showing image thumbnails in vb.net winodws application form in panel.
but while deleting with function

System.IO.File.Delete(finalunzipPath & "\001.jpg")

Showing exception as
The process cannot access the file 'D:\TempUnZip\Temp1\01.jpg' because it is being used by another process.

But if i remove that file manually from that location then it deleted what is the solution to delete file programmatically such as i can provide delete file option to user..
is there any tutorial available where show image thmbnails with delete option..
I used image object as

imgThumb = img.GetThumbnailImage(115, 115, Nothing, New IntPtr())

for generating thumbnails and finally i am doing

img = Nothing
            objPic = Nothing
            imgThumb = Nothing

but still problem is coming