Reference GridView DataKey in RowDataBound

If e.Row.RowType = DataControlRowType.DataRow Then
            'Current GridView row ID
            'Dim test2 As String = gvwPrerequisiteCourses.SelectedDataKey.Value
            Dim gridViewClassID As Integer = Convert.ToInt32(e.Row.Cells(0).Text)
 
            For Each row As DataRow In dtUsersCompletedCourses.Rows
                If row("courseID") = gridViewClassID Then
                    e.Row.BackColor = Drawing.Color.Green
                Else
                    e.Row.BackColor = Drawing.Color.Red
                End If
            Next
        End If