Upload and display Image without saving in ASP.Net using C#

Upload and display Image without saving in ASP.Net using C#:

ASPX:
<form id="form1" runat="server">
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload"
    onclick="btnUpload_Click" />
<hr />
<asp:Image ID="Image1" Visible = "false" runat="server" Height = "100" Width = "100" />
</form>

C#:
protected void btnUpload_Click(object sender, EventArgs e)
{
    System.IO.Stream fs = FileUpload1.PostedFile.InputStream;
    System.IO.BinaryReader br = new System.IO.BinaryReader(fs);
    Byte[] bytes = br.ReadBytes((Int32)fs.Length);
    string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
    Image1.ImageUrl = "data:image/png;base64," + base64String;
    Image1.Visible = true;
}