Making web control values persist [Resolved]

[mendhak]

I just made the world's simplest Web Control.

Protected Overrides Sub Render(ByVal Output As HtmlTextWriter)
            Output.Write("<b><u>" & _writewhat & "</u></b>")
        End Sub
 
        Public Property WriteWhat() As String
            Get
                Return _writewhat
            End Get
            Set(ByVal Value As String)
                _writewhat = Value
            End Set
        End Property

See?

But I have no idea how I can make the values of these persist on postbacks.

Either there's some code I have to write, or I'm overlooking something simple.

So, how?