change value of a constant variable in an argument

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VS2005

.NET3.5

VS2008

C#

VB

.NET

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alright iam having some trouble with passing a variable as an argument to a method which requires constant input. Actually iam trying to implement this :

http://msdn.microsoft.com/en-us/library/aa905668.aspx[^]

the code in which iam having trouble is :

 <XmlRpcUrl(xmlrpcurl)> _
Public Interface IWP
        Inherits IXmlRpcProxy

        <xmlrpcmethod("metaweblog.getcategories")> _
         Function getCategories(ByVal args() As String) As category()

        <xmlrpcmethod("metaweblog.newpost")> _
          Function newPost(ByVal blogid As String, ByVal username As String, ByVal password As String, ByVal content As Post, ByVal publish As Boolean) As String

    End Interface

you see <xmlrpcurl()> needs a constant value, but i want to take the input from the user (a textbox maybe ?). But is shows an error saying that a constant variable is required.

does anybody have an idea of any workaround?

Also i know about interfaces. but what is the meaning of the first line (<xmlrpcurl()>) ?