CopyFile occurs an error

In my program there is a picturebox which contains a logo of company. There is a button named 'Change logo'. When button pressed an open file dialog comes and user can choose different picture for logo. Then i want the program to copy the picture to its current directory. I use this code

            Try
            My.Computer.FileSystem.CopyFile(LogoYolu, My.Computer.FileSystem.CurrentDirectory + "\Logo\logo.bmp", True)
        Catch ex As开发者_如何学Go Exception
            MessageBox.Show(ex.Message)
        End Try

when i run the program the copyfile code occurs an error "The cannot access the file .... because it is beeing used by another process" I trying to solve this for about a day! tried to empty the picturebox before copying, or cop the picture to clipbord... and lots of thing but nothing changed. I have searched social.msdn and all over the net but nothing helped. Can you please share your ideas...

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What is 'LogoYolu'? CopyFile src and dest parameters are strings, and of course your application needs to be able to access both the source file and destination directory.