if (igThumbnailCtl.Count > 0)
{
    for (int index = 0; index < igThumbnailCtl.Count; index++)
    {
        ImGearThumbnailItem igThumbnailItem = igThumbnailCtl.Item(index);
        // Perform some operations on each item.
    }
}

If igThumbnailCtl.Count > 0 Then
    For index As Integer = 0 To igThumbnailCtl.Count - 1
        ' Perform some operations on each item.
        Dim igThumbnailItem As ImGearThumbnailItem = igThumbnailCtl.Item(index)
    Next
End If