Problem is that i cant convert to string

Dim path As String = "..\..\..\Tier1 downloads\CourseVB\"


If countNumberOfFolders > 0 Then 'if there is a folder then


    ' make a reference to a directory
    Dim di As New IO.DirectoryInfo(path)
    Dim diar1 As IO.DirectoryInfo() = di.GetDirectories()
    Dim dra As IO.DirectoryInfo

    'list the names of all files in the specified directory
    For Each dra In diar1

        Dim lessonDirectoryName() As Lesson
        lessonDirectoryName(0).lessonName = dra

    Next

'the the lesson is an object, and lessonName is the property of type string. How do i convert the directoryInfo to string?