Vb6 webservice call issue

Hi,

I did a web service code in asp.net .asmx file provided below.
This web method working fine in my asp.net application; but doesn't work in vb6 windows application. It throws an XML parser error.

Reference1:
ASP.NET and .ASMX
[WebMethod]
public void ASPNET_MsgBox(string message)
{
HttpContext.Current.Response.Write("");
}

Reference2:
VB6 Windows application code

Dim clnt As New MSOSOAPLib30.SoapClient30
Dim strsvc As String

'the client is initialized
clnt.MSSoapInit "http://192.168.10.129:83/WebService1.asmx?wsdl"

'the client calls the enc method of the service
clnt.ASPNET_MsgBox ("success")

I request someone to help me on this.

Note(Reason behind this Stuff for):
VB6 activex dll MsgBox() doesn't work in IIS hosting,but i need this msgBox or some other popup control in my VB6 dll function,that's why i am trying this kind of scenario.

I believe you guys may suggest me for the javascript or vbscript alert() function call,but situation is that alert() or some other popup should work at the VB6 DLL call itself.