Cross-Language Demo Demonstrates mixing C# and VB.NET code C# Class CSDemoClass.cs VB.NET Class VBDemoClass.vb “Main” class (C#) Demo.cs

Cross-Language Demo

Demonstrates mixing C# and VB.NET code

C# Class CSDemoClass.cs

VB.NET Class 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

Network

Managed Process

ASP.NET

Hosting the .NET Framework CLRWeb form

and custom application objects

Request and post-back form information

HTML representation of application UI

Web Server

Bro

wse

r-C

lien

tASP.NET in Context

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 data representation

HTTP transport protocol

SOAP (Simple Object Access Protocol) RPC (Remote Procedure Call) standard

Network

Managed Process

ASP.NET

Hosting the .NET Framework CLRXML Web

Service objects

SOAP MethodRequest

SOAP MethodResponse

Web Server

Ser

vice

-Cli

ent

XML Web Services

Why use XML Web Services?

Faster Development Use any .NET language XML naturally separates data from view “.NET My Services” provides core functions (user

authentication, etc.) Greater Reliability

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

Documents

Cross-Language Demo Demonstrates mixing C# and VB.NET code C# Class CSDemoClass.cs VB.NET Class VBDemoClass.vb “Main” class (C#) Demo.cs