asp.net source code blog

You may wonder what's the difference between Server.HtmlEncode and HttpUtility.HtmlEncode.

Actually, Server is an instance of HttpServerUtility:

Public ReadOnly Property Server As HttpServerUtility
Get
If (Me._server Is Nothing) Then
Me._server = New HttpServerUtility(Me)
End If
Return Me._server
End Get
End Property

And as noted HttpServerUtility.HtmlEncode makes a straight call to the shared method HttpUtility.HtmlEncode

Public Sub HtmlEncode(ByVal s As String, ByVal output As TextWriter)
HttpUtility.HtmlEncode(s, output)
End Sub

So for best performance, you could call directly to HttpUtility.HtmlEncode yourself.