c# create barcode Lesson 3 in .NET

Display QR in .NET Lesson 3

Usability and accessibility are quite similar, but there is a significant difference between the two terms to consider. Accessibility is the ability of anyone to use the user interface, whereas usability refers to how easy it is for the user to understand and interact with the UI. Accessibility features can enable higher degrees of usability, but usability can mean a lot more. Helpful documentation, tooltips, easy-todiscover features, and numerous other criteria all contribute to highly usable software. When testing the user interface of an application, usability testing includes verifying that the features of the application are discoverable and work as a user expects them to. Similarly, when testing an API or object model, usability testing includes verifying that programming tasks using the exposed functions are intuitive and that they perform the expected functionality. Usability testing also includes verifying that documentation is correct and relevant. Usability Labs Many product teams at Microsoft take advantage of usability labs. Testers are usually not directly involved in conducting the study, but they do use the data from the study to influence their approach to usability testing. For example, although the study might reveal design issues to be addressed by Program Management or Development engineers, testers often use the data on how the application is used to build scenarios or to weight testing in specific areas based on usage patterns. Of course, many other factors lead to determining the modeling of how customers use an application. (Some of those techniques and tools are covered in 13, "Customer Feedback Systems.") The formal usability studies at Microsoft are conducted in a lab with a layout similar to the one shown in Figure 11-8. Participants spend approximately two hours using an application and are usually asked to accomplish a few targeted tasks.

Web Parts controls represent a superset of the existing ASP .NET server-side controls (including custom rendered controls, user controls, and composite controls), regardless of who wrote them . For maximum programmatic control of your environment, you can also create custom Web Parts controls that derive from the System.Web.UI.WebControls.WebParts.WebPart class .

To use these switches, follow these steps: 1. Open a Command Prompt window and type the command cleanmgr /sageset:200. (The number after the colon is completely arbitrary; you can choose any other number from 0 through 65535 if you prefer.) You must supply credentials from a member of the Administrators group to begin this task. 2. In the Disk Cleanup Settings dialog box, shown in Figure 20-4, choose the options you want to apply whenever you use these settings. For this example, the options we ve selected include dump files created by Windows Error Reporting, Temporary Files, Temporary Windows Installation Files, and Thumbnails.

These methods return the core type used to hold an enumerated type s value . Every enumerated type has an underlying type, which can be a byte, sbyte, short, ushort, int (the most common type and what C# chooses by default), uint, long, or ulong . Of course, these C# primitive types correspond to FCL types . However, to make the implementation of the compiler itself simpler, the C# compiler requires you to specify a primitive type name here; using an FCL type name (such as Int32) generates the following message: "error CS1008: Type byte, sbyte, short, ushort, int, uint, long, or ulong expected." The following code shows how to declare an enumerated type with an underlying type of byte (System.Byte):

on to your Microsoft Dynamics CRM system. However, disabling a user will not change her record ownership because disabled users can still own records. Note To maintain data integrity, Microsoft Dynamics CRM does not allow you to delete users. After disabling the user, you will also probably want to reassign his or her records to a different user in the system. By doing so, you can make sure that a different user will address any open activities or follow-ups that the previous user didn t complete yet. We recommend that you reassign the records using one of two methods:

Identifying the Specific Networking Issue . . . . . . . . . . . . . . . . . . . . . . . . 12-21

All access by IIS to resources served by the Web server is governed by Windows NTFS permissions. This means that all access is through a local user ID, with associated groups. It is important to distinguish between the security context that the user believes he has, and the security context that the server is using to serve that user s access. A good example is Anonymous Authentication, which by default is associated with the IUSR account for the purpose of controlling what files and resources are accessible. Although authentication settings are enabled, disabled, and defined at the server, Web site, or virtual directory level, most of their configuration settings are stored in the server-wide applicationHost.config file, under the following section:

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< xml version="1.0" > <configuration > <appSettings> <add key="Copyright" value="Copyright 2009 " /> <add key="Company" value="ThisIsACompanyName" /> </appSettings> <connectionStrings/> </configuration>