ASP.NET

Dim MyImage(15) As String
Private Sub GetImages()
    MyImage(0) = "1.png"
    MyImage(1) = "2.png"
    MyImage(2) = "3.png"
    MyImage(3) = "4.png"
    MyImage(4) = "5.png"
    MyImage(5) = "6.png"
    MyImage(6) = "7.png"
    MyImage(7) = "8.png"
    MyImage(8) = "9.png"
    MyImage(9) = "10.png"
    MyImage(10) = "11.png"
    MyImage(11) = "12.png"
    MyImage(12) = "13.png"
    MyImage(13) = "14.png"
    MyImage(14) = "15.png"
    MyImage(15) = "16.png"
End Sub

Sub GetNextImage(ByVal Src As Object, ByVal Args As EventArgs)
    'Retrieve the array from view state
    MyImage = ViewState("PictureArray")

    'Increment the image counter
    ViewState("Counter") += 1
    If ViewState("Counter") > 15 Then
        ViewState("Counter") = 0
    End If

    'Assign the next image to the control
    BannerImage.ImageUrl = MyImage(ViewState("Counter"))
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    If Not Page.IsPostBack Then
        '--Load as array with image ursl and save to view state
        Call GetImages()
        ViewState("PictureArray") = MyImage

        '--Establish a counter to keep track of the array index
        ViewState("Counter") = 0
        BannerImage.ImageUrl = MyImage(ViewState("Counter"))
    End If
End Sub