Posting Data to ASP.NET
Device Side
To post data to an ASP.NET page, the device side code is the same as what you would use for any other backend technology:
req = Ajax("/sendData_ajaxPost.aspx", "POST", "myText=" & txtSend.value)
See Ajax and Ajax_made_Simple for more information.
Server Side
There are many ways to process the data using ASP.NET. The simplest would be to embed code in the .aspx file. For instance:
<%
Dim myText as String
myText = Request.Form("myText")
'Additional processing of myText here...
%>
<html><body>
<p>myText is: <%=myText%></p>
</body></html>
There are several other tutorials online that deal with various ways of creating ASP.NET pages.