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Introduction The idea of string enumerations in C# (and the lack thereof), has bothered me for a while. Enum's are useful things but only allow the storage of numeric types. What if you want to use strings? Background It struck me that I had a number of requirements when using string 'constants'.
In the previous example ( How-To program with Excel and C# ), I demonstrated how to program in Excel 2007 using a Workbook Project in Visual Studio 2008. This example will use the Addin Project in Visual Studio 2008 to create a ribbon that can be inserted into any Excel file automatically. Getting Started If you are familiar with VS2008, start by creating a Microsoft Office 2007 Excel Addin Project.
.Net is the much hyped revolutionary technology gifted to the programmer’s community by Microsoft. Manyfactors make it a must use for most developers. In this article we would like to discuss one of the primary advantages of .NET framework -the ease in memory and resource management. Every program uses resources of one sort or another-memory buffers, network connections, database resources, and soon. In fact, in an object-oriented environment, every type identifies some resource available for a program’s use.
Alright! Here it is: the revised “Dispose, Finalization, and Resource Management” Design Guideline entry. I mentioned this work previously here and here . At ~25 printed pages, it's not what I would consider to be a minor update.
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Overview The WMI Code Creator tool generates code that uses WMI to obtain management information or perform management tasks. You can use the tool to learn how to manage computers using WMI scripting and WMI .NET. The tool generates code that runs on the local computer, a remote computer, or a group of remote computers based on your selection from the Target Computer menu on the tool. You can also execute the generated code directly from the tool.
System.Data.SQLite is an ADO.NET adapter for SQLite . System.Data.SQLite was started by Robert Simpson. Robert still has commit privileges on this repository but is no longer an active contributor.
User Account Control dialog in Windows 7 when loading unsigned code User Account Control dialog in Windows 7 when loading signed code User Account Control ( UAC ) is a technology and security infrastructure introduced with Microsoft 's Windows Vista and Windows Server 2008 operating systems , with a more relaxed [ 1 ] version also present in Windows 7 and Windows Server 2008 R2 . It aims to improve the security of Microsoft Windows by limiting application software to standard user privileges until an administrator authorizes an increase or elevation. In this way, only applications trusted by the user may receive administrative privileges, and malware should be kept from compromising the operating system. In other words, a user account may have administrator privileges assigned to it, but applications that the user runs do not inherit those privileges unless they are approved beforehand or the user explicitly authorizes it.
User Account Control (UAC) is a new technology introduced by Microsoft in Windows Vista and most of the time it is misunderstood by users and developers. It’s main purpose is to protect the operating system by running applications with reduced privileges. Why should we use this? Most applications DO NOT require full privileges. Think to the applications you have written and ask yourself if most of the job can be done without full writes (if you write to disk think if you could write in the user’s folder or an isolated storage, if writing in registry to HKLM think if you could write to HKLU, etc).
In part 1 of this tutorial I have presented how to run an application with and without elevation by specifying this from another process. However there are some situations when an application cannot be run without administrative rights. For example a system configuration utility requires administrative rights to change some global policies. In order to force an application to run only if the current user is administrator or can provide administrative credentials you must add a manifest to the C# project. The manifest is an XML file named <application_name>.exe.manifest with the following content: What is important is the requestedExecutionLevel element.
After a long period since I wrote part 2 of this article I decided to add some extra information. There is one thing that was missed by the previous two articles: the design of UAC enabled applications. If you use Windows Vista/7 then you know that buttons and links which elevate privileges are preceded by a shield icon. This is the way Microsoft decided to inform the user about the effect of clicking that control.
Installation of a ClickOnce application ClickOnce is a Microsoft technology that enables the user to install and run a Windows application by clicking a link in a web page. (Such applications are known as Smart clients .) ClickOnce is a component of Microsoft .NET Framework 2.0 and later, supports deploying applications made with Windows Forms or Windows Presentation Foundation .
With the System.Deployment.Application namespace, you can program custom upgrade behavior into your ClickOnce application. The key class in this namespace is ApplicationDeployment . You can test whether your deployment has an available update by using either the CheckForUpdate or CheckForUpdateAsync methods; the latter method raises the CheckForUpdateCompleted event when it has successfully completed. CheckForDetailedUpdate returns important information about the update, such as its version number and whether it is a required update for current users. If an update is available, you can install it by using Update or UpdateAsync ; the latter method raises the UpdateCompleted event after installation of the update is finished. For large updates, you can receive progress notifications through the CheckForUpdateProgressChanged and UpdateProgressChanged events, and use the information in ProgressChangedEventArgs to notify the user of the download status.
ClickOnce provides two ways to update an application once it is deployed. In the first method, you can configure the ClickOnce deployment to check automatically for updates at certain intervals. In the second method, you can write code that uses the ApplicationDeployment class to check for updates based on an event, such as a user request. The following procedures show some code for performing a programmatic update and also describe how to configure your ClickOnce deployment to enable programmatic update checks.
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