Iterate though collection in VB .Net (like it was an associative array!)

SenderInfo should be a Dictionary<String,String>. Here's the documentation and example code, at the bottom, including VB.NET.

It's hard to be sure right now what you want to do with this code, and that can make all the difference in the world for what I would recommend to do instead. But it sounds like you really want a class like this:

<Serializable()>
Public Class Sender

    Public Property Name
    Public Property Address1
    Public Property City
    Public Property State

End Class

And then replace your existing code with something like this:

Dim xmlRdr As New Xml.Serialization.XmlSerializer(GetType(Sender))

Using fileStream As New StreamReader(fName)
     Dim mySender As Sender = xmlRdr.Deserialize(fileStream)
End Using

You'll probably need a few more attributes in the class to tweak what the deserializer expects the xml to look like. You can read more about serialization here:
http://msdn.microsoft.com/en-us/library/ms950721.aspx