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Transcript 
Cross-Language Demo

Demonstrates mixing C# and VB.NET code

C# Class


VB.NET Class


CSDemoClass.cs
VBDemoClass.vb
“Main” class (C#)

Demo.cs
CSDemoClass.cs
using System;
namespace CSDemo {
public class CSDemoClass {
…
protected String getDateTime(){
return DateTime.Now.ToString();
}
}
}
VBDemoClass.vb
Public Class VBDemoClass
Public Sub ShowTime(ByVal time as String)
MsgBox(time, MsgBoxStyle.Information,
“VB MsgBox”)
End Sub
End Class
Demo.cs
using System;
using CSDemo;
using VBDemo;
namespace Demo {
class Demo {
static void Main(string[] args) {
String date;
CSDemoClass csApp = new CSDemoClass();
VBDemoClass vbApp = new VBDemoClass();
}
}
}
date = csApp.getTime();
vbApp.ShowTime(date);
Cross-Language Example
Using .NET
Jiunwei Chen
ASP.NET

Evolution of ASP (Active Server Pages)


Traditional web scripting language
Features





Use any .NET language (C#, VB, COBOL, etc)
Compiled and executed in native machine code
Allows for code-behind
Objected-oriented web development environment
Web Forms and Web Services
Browser-Client
ASP.NET in Context
Network
Managed Process
Request and post-back
form information
ASP.NET
Web form
and custom
application
objects
HTML representation
of application UI
Hosting the .NET
Framework CLR
Code Behind

Separation of the HTML and the code



Markup resides in an .ASPX file
Code lies in a C# (.CS) file or managed assembly
(.DLL)
ASP.NET


Class is derived from System.Web.UI.Page
HTML is generated and sent to the browser
Time.aspx
<% @Page Language="C#"
Inherits=“TimePage" Src=“Time.cs" %>
<html>
<body>
<TITLE>Time Page</TITLE>
<H1 align="center">
The time is <% OutputTime();%>
</H1>
</body>
</html>
Time.cs
using System;
using System.Web.UI;
public class TimePage:Page{
protected void OutputTime(){
Response.Write(
DateTime.Now.ToString(“T"));
}
}
Time Example
Web Forms


Core of ASP.NET
Separates interface from code logic (View /
Model)


ASP.NET detects browser and chooses rendering
Server-side controls


Can use visual tools to layout controls
Similar to VB, JavaBeans, WebObjects
WebControls.aspx
<% @Page Language="C#" Inherits="DatePage" … %>
<html>
...
<Form method="post" runat="server">
...
<asp:Calendar
id="calendar" runat="server">
</asp:Calendar>
<asp:TextBox id="date"
runat="server"/><br>
<asp:Button id="button"
Text=“Submit"
runat="server"></asp:Button>
...
Web Controls Example
XML Web Services


Small, re-usable application components
shared over the Web as services
XML


HTTP


data representation
transport protocol
SOAP (Simple Object Access Protocol)

RPC (Remote Procedure Call) standard
Service-Client
XML Web Services
Network
Managed Process
SOAP Method
Request
XML Web
Service
objects
SOAP Method
Response
ASP.NET
Hosting the .NET
Framework CLR
Why use XML Web Services?

Faster Development




Greater Reliability


Use any .NET language
XML naturally separates data from view
“.NET My Services” provides core functions (user
authentication, etc.)
Harness all the benefits of the CLR
Integration

Built off XML and SOAP
References


Clark, Jason, .NET Tutorials, 2001
(Accessible at www.devhood.com)
Microsoft Corporation, Microsoft.NET,
http://www.microsoft.com/net/, 2002
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