<cc1:MyControl Header="Some Header" Content="Some Content" />

<h1>Some Header</h1>
<p>Content</p>

<%= html.MyControl( "Some header", "Some content" ) %>


<Extension()> _
Public Function MyControl(ByVal htmlHelper As HtmlHelper, _
                         ByVal Header As String, _
                         ByVal Content As String) As String

Dim sb As New StringBuilder()
sb.AppendFormat("<h1>{0}</h1>", Header)
sb.AppendFormat("<p>{0}</p>", Content)
Return sb.ToString()
End Function