How to implement Fancybox in Asp.net

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ASP.NET

I have an asp.net project, i am using file uploader control to upload images, i have preview button to preview the image.i want to use fancybox on the preview image.my preview image is working , code is below. please help me...

aspx:

<asp:FileUpload ID="QuestionUp" runat="server" onchange="" CssClass ="Fileupload"  />
                                       <div>
                                           <asp:Image ID="Image2" runat="server" Height="26px" Width="222px" />
                                       </div>

vb:

Protected Sub btnPreview_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        QuestionUp.SaveAs(Server.MapPath("~/UploadImg/Preview/test.jpg"))
        Image2.ImageUrl = "~/UploadImg/Preview/test.jpg"
        Image2.Visible = True

End Sub