generate barcode in Figure 7-8 Making settings for the selection of a period in .NET

Incoporate barcode data matrix in .NET Figure 7-8 Making settings for the selection of a period

When compiling this method, the C# compiler produces the following: error CS0117: int does not contain a definition for ToSingle . This error message confuses the developer even more because it s clearly stating that the Int32 type doesn t define a ToSingle method when, in fact, it does. To call ToSingle on an Int32, you must first cast the Int32 to an IConvertible, as shown in the following method:
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B. The DHCP server is not authorized in Active Directory.
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Sample of Visual Basic Code <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Customer Details</h2> <%: ViewData("CustomerName")%> </asp:Content> Sample of C# Code <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Customer Details</h2> <%: ViewData["CustomerName"]%> </asp:Content>
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Table 9-2: .NET Project Configuration Schema Node Description {B5E9BD34-6D3E-4B5D-925E-8A43B79820B4} </ProgLanguage> <Configuration> <ConfigName> The collection of properties for a single build configuration. The name of the configuration. Corresponds to a target configuration in the Visual Studio .NET IDE configuration manager. Example: <ConfigName>Debug</ConfigName> <Properties> <Property> <PropertyName> The collection of properties for this configuration. The description of an individual property. The name of a Project object property. This property must exist in the specific language's Project automation object. Example: <PropertyName>CheckForOverflowUnderflow</PropertyName> <PropertyType> Indicates the type for the property name. This can be only Boolean, String, or Enum. If the type is String, you must include an attribute type OpType, either Overwrite or Append, which determines how the string value will be changed. If the type is Enum, you must include an attribute type Name, which is the name of the enumerated type utilized by the specific Project property. Example: <PropertyType>Boolean</PropertyType> Example: <PropertyType Name="prjWarningLevel"> Enum</PropertyType> <PropertyValue> The value you want the property to have. For Boolean types, this is either 1 or 0. For String types, it is the string you want either appended or overwritten. For Enum types, it is the numeric value of the enumeration. Example: <PropertyValue>1</PropertyValue> Probably the easiest way to illustrate what a .NET configuration looks like is to show two stripped-down examples. Listing 9-5 shows the minimal configuration file necessary to turn on incremental building in a debug build and turn it off for a release build of a Visual Basic .NET project. Listing 9-6 shows how to set the warning level to prjWarningLevel4 in a C# release build project only. Listing 9-5: Visual Basic .NET SettingsMaster project for turning on incremental linking in a debug build and off in a release build <Configurations> 397
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The preceding line could have been written like this instead:
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The implementation of a similar algorithm in SQL Server 2005 is dramatically simpler and faster, mainly because it uses CTEs and the ROW_NUMBER function. Run the code in Listing 9-19 to return the subtree of employee 1, with siblings sorted by empname with indentation, and generate the output shown in Table 9-27.
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For this reason, the credentials you supply should be for an account that does not represent a real person, and whose rights and privileges are limited only to accessing the Web site s folders and files. The password for this account should not be shared with any other account, and should be randomly generated, perhaps using the command:
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Starting with Windows Vista, and also with Windows Server 2008, both LM and NTLM are deprecated by default. NTLM is still supported for inbound authentication, but for outbound authentication a newer version of NTLM, called NTLMv2, is sent by default instead. Prior versions of Windows (back as far as Windows NT 4.0 Service Pack 4) could be configured to behave this way, but it was not the default. Technically speaking, the computer will accept LM for inbound authentication but by default neither Windows Vista nor Windows Server 2008 store the LM hash. Therefore, there is no way for them to authenticate an inbound LM response. You can control the authentication behavior, starting with Windows NT 4.0 Service Pack 4, using the LMCompatibilityLevel registry setting, shown in Group Policy as Network Security: LAN Manager Authentication Level. (See Figure 2-9.)
Puzzle 2: Chocolate Bar
Table 8-1
A primary feature of most goto discussions is a shallow approach to the question. The arguer on the gotos are evil side presents a trivial code fragment that uses gotos and then shows how easy it is to rewrite the fragment without gotos. This proves mainly that it s easy to write trivial code without gotos. The arguer on the I can t live without gotos side usually presents a case in which eliminating a goto results in an extra comparison or the duplication of a line of code. This proves mainly that there s a case in which using a goto results in one less comparison not a significant gain on today s computers. Most textbooks don t help. They provide a trivial example of rewriting some code without a goto as if that covered the subject. Here s a disguised example of a trivial piece of code from such a textbook:
Ease of use Since custom tasks have speci c properties for inputs and outputs, they are very easy to use. Better input validation You can write .NET code to validate the parameters that the script is requesting be sent to the executable. Easier path resolution Sometimes you may not know where the .exe le resides. You may have to search the registry or examine a set of folders. This is typically performed more easily in code than in an MSBuild script. Pre- and post-processing Because you are creating a custom task, you can perform actions before and/or after the execution of the executable. Parsing stdout and stderr The ToolTask class can detect errors and warnings from messages that are sent into the stdout and stderr streams. Enables task execution skipping By overriding the SkipTaskExecution method, you can programmatically determine if the task should be skipped.
Most of the programs you use in Windows are associated with particular file types and protocols. These associations are what enable you, for example, to double-click a Windows Media Audio (.wma) file in Windows Explorer and have your favorite audio program play the file; or click an internet hyperlink in a document or e-mail message and have your favorite web browser take you to the appropriate website. The Windows Setup program establishes many of these associations for you when the operating system is installed. The Setup programs for various applications also create associations with the file types those programs can use. (Sometimes such programs, when installed, change existing file-type associations; generally, but not invariably, they ask for your permission before doing this.) But regardless of how the associations between programs and file types and protocols are currently set, Windows makes it easy for you to see and modify the settings. You can inspect and alter current defaults by clicking Default Programs, on the right side of the Start menu, or opening Control Panel, clicking Programs, and then clicking Default Programs. Either way, you arrive at the section of Control Panel shown in Figure 3-26.
file changes, irrespective of the contents that you might have written to the file. In other words, the event also fires if you simply open and save the file without entering any changes. m_watcher.NotifyFilter = NotifyFilters.LastWrite; m_watcher.Changed += new FileSystemEventHandler(this.OnChanged); // Start getting notifications m_watcher.EnableRaisingEvents = true; The changes you can register to be detected are originated by four events: Changed, Created, Deleted, and Renamed. In this example, we are interested only in the changes that modify an existing file, so let's handle only the Changed event, as shown here: private void OnChanged(object source, FileSystemEventArgs e) { HasChanges = true; if (UnderlyingDocumentChanged != null) UnderlyingDocumentChanged(this, EventArgs.Empty); } Any file system event passes to the handlers a FileSystemEventArgs object that contains information about the event for example, the name of the files involved and a description of the event that just occurred. The XmlHotDocument class processes the Changed event by simply setting the HasChanges property to true and bubbling the event up to the caller application. In the process, the original event is renamed to a class-specific event named UnderlyingDocumentChanged. In addition, no argument is passed because the client application using the XML DOM needs to know only that some changes have occurred to the underlying documents currently being processed. After it is completely set up, the FileSystemWatcher class starts raising file system events only if you set its EnableRaisingEvents property to true. Changing the value of this property to false is the only way you have to stop the watcher from sending further events. Note When monitoring a file or a folder through a FileSystemWatcher class, don't be surprised if you receive too many events and some events that are not strictly solicited. The class is a watchful observer of what happens at the file system level and correctly reports any change you registered for. Many operations that look like individual operations are actually implemented in several steps, each of which can cause an independent event. In addition, you might have software running in the background (for example, antivirus software) that performs disk operations that will be detected as well.
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