Awarding Permissions in .NET

Generating QR Code in .NET Awarding Permissions
Awarding Permissions
Paint QR-Code In .NET Framework
Using Barcode generator for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
Even if your assembly has permission to perform an action, such as calling unmanaged code, it's not necessarily the case that another assembly calling your assembly has those permissions CAS is set up so that a request for a permission will be denied unless everyone in the call chain has the needed permission For example, even if an assembly hosted in IE has permission to call into unmanaged code, as of NET 1x the managed code hosting that assembly does not have that permission If the control needs to exercise a permission that the code above it in the call chain doesn't have, the control must grant the permission it has to everyone hosting it You do this using the Assert method on the permission object:
QR Code JIS X 0510 Reader In .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications.
void label1_Click(object sender, EventArgs e) { // Make sure we have permission to call unmanaged code SecurityPermissionFlag flag = SecurityPermissionFlagUnmanagedCode; SecurityPermission perm = new SecurityPermission(flag); if( !HavePermission(perm) ) return; // Grant managed hosting code permission to call unmanaged code permAssert(); if( OuchEvent != null ) OuchEvent(10); } In this code, we create a permission object again, but after checking to make sure we have the appropriate permission, we also grant that permission, albeit temporarily, until the method returns In general, granting permissions in this way is a really bad idea and should be used only in a very narrow scope The reason that NET is checking everyone in the call chain is to make sure that bad assemblies don't coerce good assemblies into performing their evil deeds By asserting permission, you're telling NET that you'll vouch for everyone in the call chain a weighty responsibility to take onto your shoulders [ Team LiB ]
Paint Barcode In Visual Studio .NET
Using Barcode drawer for .NET Control to generate, create bar code image in VS .NET applications.
[ Team LiB ]
Reading Barcode In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
No-Touch Deployment
QR Code Creation In Visual C#
Using Barcode printer for .NET framework Control to generate, create QR-Code image in .NET applications.
In addition to letting you deploy WinForms controls, NET also lets you use IE to deploy entire WinForms applications This is a completely new feature for the Windows platform You can best see its value by trying it:
Quick Response Code Drawer In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
1 Using the New Project dialog, create a new Windows application and call it DeploymentFun 2 Feel free to drag and drop some controls from the Toolbox, but before going too far, compile your application 3 In the shell explorer, navigate to your DeploymentFun\bin folder and right-click on the Debug folder, choosing Properties
Print QR Code In VB.NET
Using Barcode printer for .NET framework Control to generate, create QR-Code image in .NET applications.
4 Choose Web Sharing and turn it on, using DeploymentFun as the name of the share This will create a new Internet Information Server (IIS) Web application containing DeploymentFunexe 5 Now surf to your WinForms app using Start | Run and the following URL: http://localhost/DeploymentFun/DeploymentFunexe 6 After basking in the glory of using no-touch deployment (NTD) to deploy a real Windows application over the Web without doing any setup, stop playing around and read the rest of this chapter!
Barcode Creation In .NET Framework
Using Barcode generation for VS .NET Control to generate, create bar code image in Visual Studio .NET applications.
Application Download
Paint Code-128 In .NET
Using Barcode drawer for VS .NET Control to generate, create Code 128 Code Set A image in VS .NET applications.
As a test of the no-touch deployment model inFigure 154[4]
Creating Barcode In VS .NET
Using Barcode printer for VS .NET Control to generate, create barcode image in .NET applications.
for WinForms applications, I built a simple game, as shown
Draw USS-128 In .NET Framework
Using Barcode maker for Visual Studio .NET Control to generate, create EAN / UCC - 14 image in VS .NET applications.
Any similarity to any other very popular game that you may already be familiar with is strictly intentional
Generate 2 Of 5 Industrial In Visual Studio .NET
Using Barcode printer for .NET Control to generate, create Code 2 of 5 image in VS .NET applications.
Figure 154 The Game of Wahoo!
Bar Code Scanner In .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in VS .NET applications.
On the Web server, deployment of a NET application is merely a matter of dropping the exe file into a Web application directory so that the Web server can hand out the bits on demand The NET runtime is not required on the server, nor is Microsoft's Internet Information Server nor even Windows itself On the client side, however, things are a bit more interesting When you feed Internet Explorer an URL such as http://localhost/wahoo/wahooexe, it forms an HTTP request for the wahooexe file to be streamed back to the client:
GS1 - 12 Printer In VS .NET
Using Barcode creation for ASP.NET Control to generate, create UPCA image in ASP.NET applications.
GET /wahooexe HTTP/11 Accept: */* Accept-Language: en-us Accept-Encoding: gzip, deflate User-Agent: Mozilla/40 (compatible; MSIE 60; Windows NT 51; Q312461; NET CLR 103705) Host: localhost Connection: Keep-Alive The response from the server is just a stream of bytes: HTTP/11 200 OK Server: Microsoft-IIS/51 Date: Fri, 01 Feb 2002 02:11:29 GMT Content-Type: application/octet-stream
DataMatrix Maker In Java
Using Barcode encoder for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
Accept-Ranges: bytes Last-Modified: Fri, 01 Feb 2002 01:41:16 GMT ETag: "50aae089c1aac11:916" Content-Length: 45056 <<stream of bytes from wahooexe>> In addition to the bytes themselves, the last modified date and time are cached by IE on the client side This is used to form a request each subsequent time that the application is launched using the same URL:
Print Barcode In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
GET /wahooexe HTTP/11 Accept: */* Accept-Language: en-us Accept-Encoding: gzip, deflate If-Modified-Since: Fri, 01 Feb 2002 01:41:16 GMT If-None-Match: "50aae089c1aac11:916" User-Agent: Mozilla/40 (compatible; MSIE 60; Windows NT 51; Q312461; NET CLR 103705) Host: localhost Connection: Keep-Alive The If-Modified-Since header is kept in IE's download cache and is sent back with each request In this way, if the bits on the server haven't changed, the server can respond with a header that indicates that the cache is still good, reducing the payload that needs to be downloaded to the client: HTTP/11 304 Not Modified Server: Microsoft-IIS/51 Date: Fri, 01 Feb 2002 02:42:03 GMT ETag: "a0fa92bc8aac11:916" Content-Length: 0
Make ANSI/AIM Code 39 In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
The bytes themselves are cached in two places: IE's download cache, managed by IE, and the NET download cache , which is a cache for NET assemblies (both exe and dll files) downloaded on demand The contents of the NET download cache can be examined using gacutilexe /ldl and cleared using gacutilexe /cdl If, during your testing, you'd like to ensure that a download happens, make sure to clear IE's cache using the Internet control panel and clear NET's cache using gacutil
EAN-13 Supplement 5 Maker In Java
Using Barcode drawer for Java Control to generate, create European Article Number 13 image in Java applications.
Encode ANSI/AIM Code 128 In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create Code 128A image in ASP.NET applications.