dot net smart_client_development

Smart Client application
Development
Using
Presented by:
Tamajit Chakraborty,
Computer Science & Engineering ,
6th semester,
Roll 09

Stuff we’ll talk about…
client model
Windows Forms
Code Access Security
Smart Device Programmability
Office System 2003
Visual Studio Tools for Office

The Client Model
Traditional Rich Client
 Uncompromised
user experience
 Flexible offline operation & storage
 Strong integration with client-side APIs
(Application programming interface)
 Great developer tools support
 Serious security issues, viruses, etc.
Traditional Web Client
 Broad desktop reach
 Easy administration
 Impaired or frustrating user experience
 No offline operation or storage
 Poor integration with client-side APIs
 DHTML / scripting tools non-existent
.NET Framework Smart Client
To the metal performance
 GDI(Graphics Device Interface)+
& DirectX graphics
 Direct Win32 & COM as needed
“Real time” (study of hardware and
software systems) interactivity
Friction free deployment & versioning
 Launch app from a URL
 Embed control in a web page
Safe and secure app execution
 Code access security
Automatic online / offline support
 Application updater component

Windows Forms
The .NET Framework Smart Client
Operating System
Common Language Runtime (CLR)
Base Class Libraries (BCL)
.NET and XML
ASP.NET
Web Forms Web Services
Windows
Forms
Common Language Specification
Visual
Basic C# J# …
VisualStudio.NET
C++

Windows Forms
The .NET Framework Smart Client
Smart client is a term describing an
application environment which:
Delivers applications over a web HTTP
connection
Does not require installation (or provide
automated installation and updates)
Automatically updates without user action
Has the look and feel of desktop
applications
More user friendly.

Issues of Code Security
The enemy is among us – no perimeters
Innocent but trusted code often plays host to
malicious mobile code
Malicious code can do anything that the user
has permissions to do
The user will always make the wrong security
decision

LIBRARY
Only people
with a
membership
card can use
books.
Code Security in Pictures
Security
Policy
ZYX
Y, would you get a
book for me?
Z, would you get a
book for X?
I would like to
check out a book
Are you and all who will handle this book members?
Shared
Library
Luring
attack
Untrusted
code
Stack
Walk
Security
Demand
Call
Chain
MEMBER
card
Evidence
MEMBER
card
MEMBER
card

Are you and all who will handle this book members?
LIBRARY
Only those
who have a
member card
can check out
a book.
ZYX
Y, would you get a
book for me?
Z, would you get a
book for X?
I would like to
check out a book
X is not a
member,
but I vouch
for him.
Stack
Modifier:
Assert() I don’t
want to be
responsibl
e – won’t
pass
books
promoting
violence!
Stack
Modifier:
Deny()
I will only
pass
books
printed
after 1980
Stack
Modifier:
PermitOnly()
Code Security in Pictures

All Code in Call Chain is Evaluated
MYAPP (INTRANET)
. . . .
myComponent.ReadSetting(key);
. . . .
MYCOMPONENT (LOCALMACHINE)
. . . .
Stream fileStream = FileStream.Open(“settings.xml”);
. . . .
Calls
Got Permission?
Got Permission?
Exception
Calls
FRAMEWORK
public FileStream (string name) {
FileIOPermission fp = new FileIOPermission(name)
fp.Demand()
. . . .
}



Stack Walk Stopped by Assert
MYAPP (INTRANET)
. . . .
myComponent.ReadSetting(key);
. . . .
MYCOMPONENT (LOCALMACHINE)
. . . .
FileIOPermission fp = new FileIOPermission
(FileIOPermissionAccess.Read, “settings.xml”);
fp.Assert();
Stream fileStream = FileStream.Open(“settings.xml”);
Calls
Got Permission?
Calls
FRAMEWORK
public FileStream (string name) {
FileIOPermission fp = new
FileIOPermission(name)
fp.Demand()
. . . .
}
 Returns
Returns

Device Programmability
Broad Reach vs. Smart Device
ASP.NET Mobile
Controls
Mobile Web
Browser
Remote Web Pages
Device Operating System
Smart Device
Programmability
.NET Compact
Framework
Local Code
Smart client

Remote Debugging
Same user experience as desktop
 Compile application for device
 Automatically deploys to selected device
 Output Window used for deployment messages
Supported features include
 On-device debugging
 Breakpoints
 Multi-language debugging
 Call Stack, Watch windows

SQL Server™ Windows® CE Edition 2.0
On-device data engine for Windows CE-
powered devices
Rich replication and synchronization with SQL
Server
Designed for high performance in resource-
constrained environment

Visual Studio Tools for Office
New Projects Types for VS.NET
Power and richness of the Office System
 “Code behind” for Word & Excel 2003
 Secure auto-deployment of .NET application code
VS.NET developer productivity
 Real languages – Visual Basic .NET and Visual C#
 IntelliSense, code outlining, dynamic help, etc.
 Advanced debugging environment
 Visual designers for WinForms, XML, data, etc.
 Power of the .NET Framework and web services
Visual Studio Tools can be downloaded from:
http://msdn.microsoft.com/en-us/vstudio

Advantage
“Friction Free” Deployment
No “installation” necessary – just run it
 Code downloads on-demand from any web server
 Saved in cache and dynamically updated
Copy to a folder and delete when done
 No registry entries or other dependencies
Windows Installer technology
 Self repairing installations, rollback, signing

Useful Resources
http://en.wikipedia.org/wiki/.NET_Framework
http://en.wikipedia.org/wiki/Smart_client
http://www.windowsforms.net
 TaskVision, sample code, forum, articles, etc.
Mobility and the .NET Compact Framework
 http://msdn.microsoft.com/mobility
http://msdn.microsoft.com/office
 Visual Studio Tools for Office, etc.
http://msdn.microsoft.com/community
 Hundreds of active third party communities
http://msdn.microsoft.com/newsgroups
 dotnet.framework.windowsforms
 vsnet.tools.office

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