how to get preview of image before save in upload filder

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ASP.NET

i'm using file upload control
on submit click my image having been save in uploads folder
but i'm unable to find the image preview on control image 1
please help me in diplaying preview

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        txtEmployeeid.Focus()
        If IsPostBack = True Then
<pre lang="vb">Dim ext As String = Path.GetExtension(FileUpload1.FileName)
           Dim newfile As String = txtEmployeeid.Text + ext
           If FileUpload1.HasFile Then
               Dim theFileName As String = Path.Combine(Server.MapPath(&quot;~/Uploads&quot;), newfile)
               If File.Exists(theFileName) Then
                   File.Delete(theFileName)
               End If
               FileUpload1.SaveAs(theFileName)
           End If</pre>