generate qr code using c# Part I Fundamentals in .net C#

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Sample of Visual Basic Code Public Shared Function GetPagedCustomersSorted( _ ByVal sortCol As String, ByVal pageStart As Integer, _ ByVal numRecords As Integer) As DataTable If numRecords <= 0 Then numRecords = 10 If sortCol = "" Then sortCol = "CompanyName" Dim cnn As New SqlConnection(_cnnString) Dim sql As String = "SELECT * FROM customers" Dim cmd As New SqlCommand(sql, cnn) Dim adp As New SqlDataAdapter(cmd) cnn.Open()
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Silverlight Design-Time App.xaml Resources Silverlight composite applications can be structured in several ways to allow run-time delayed loading of assemblies or to reduce initial .xap download size. One strategy that you can use is to create your main Silverlight application, and then create a satellite assembly for each module. When you add the satellite project assembly, you can choose one of the Silverlight application project templates or the Silverlight class library project template. Choosing a Silverlight application project template for a satellite assembly provides a deployment benefit: the assembly will be packaged as a .xap file when built. However, there is a side effect that affects the visual designers when more than one Silverlight application is present in a single solution. The main Silverlight application will have its application resources merged in App.xaml. The problem is that the visual designer consumes resources exposed in App.xaml. Because there is more than one Silverlight application in the solution, the visual designer does not attempt to use resources from another Silverlight application; instead, it uses only those resources from the active Silverlight application. Expression Blend 4 provides a solution to this problem. When Expression Blend detects this condition, it displays a dialog box that allows you to select a design time resource dictionary that will be used across all projects in the solution. Visual Studio 2010 does not have this feature; therefore, satellite Silverlight application assemblies will not have the normal rich visual design-time experience unless you merge application-level resources in the local assembly. If you choose to merge application-level resources for a better visual design experience, you must remember to remove them before deploying your application. The following are some of the characteristics of a designer friendly (also known as a blendable or tool-able) application: It provides a productive editing experience by using the Visual Studio and Expression Blend designers. It is tooling-enabled. For example, it allows you to use the binding builder. It provides design-time sample data when required. It allows code to be executed at design time without causing unhandled exceptions. The following actions are performed many times during an editing session. User code that is not designer friendly will cause one or more of these actions to fail, thus reducing the productivity and creativity of a developer or designer. Design surface actions: Constructing objects Loading objects Setting property values Performing design surface gestures Using a control as the root element Hosting a control inside another control
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Create the ClaimsPrincipal object with the claims inside.
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Here s the XML value this query returns in the first output row:
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1 Introducing Silverlight 3
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Why did we resort to Page.Request instead of accessing the drop-down list control directly with a piece of code like the following
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metadata tables first and then uses the manifest to get the names of the other files that are in the assembly. Here are some characteristics of assemblies that you should remember: An assembly defines the reusable types. An assembly is marked with a version number. An assembly can have security information associated with it. An assembly s individual files don t have these attributes except for the file that contains the manifest metadata tables. To package, version, secure, and use types, you must place them in modules that are part of an assembly. In most cases, an assembly consists of a single file, as the preceding App.exe example does. However, an assembly can also consist of multiple files: some PE files with metadata and some resource files such as .gif or .jpg files. It might help you to think of an assembly as a logical EXE or a DLL. I m sure that many of you reading this are wondering why Microsoft has introduced this new assembly concept. The reason is that an assembly allows you to decouple the logical and physical notions of reusable types. For example, an assembly can consist of several types. You could put the frequently used types in one file and the less frequently used types in another file. If your assembly is deployed by downloading it via the Internet, the file with the infrequently used types might not ever have to be downloaded to the client if the client never accesses the types. For example, an ISV specializing in UI controls might choose to implement Active Accessibility types in a separate module (to satisfy Microsoft s Logo requirements). Only users who require the additional accessibility features would require that this module be downloaded. You configure an application to download assembly files by specifying a codeBase element (discussed in 3) in the application s configuration file. The codeBase element identifies a URL where all of an assembly s files can be found. When attempting to load an assembly s file, the CLR obtains the codeBase element s URL and checks the machine s download cache to see if the file is present. If it is, the file is loaded. If the file isn t in the cache, the CLR downloads the file from the URL into the cache. If the file can t be found, the CLR throws a FileNotFoundException exception at runtime. I ve identified three reasons to use multifile assemblies: You can partition your types among separate files, allowing for files to be incrementally downloaded as described in the Internet download scenario. Partitioning the types into separate files also allows for partial or piecemeal packaging and deployment for shrink wrapped scenarios. You can add resource or data files to your assembly. For example, you could have a type that calculates some insurance information. This type might require access to some actuarial tables to make its computations. Instead of embedding the actuarial tables in your source code, you could use a tool (such as the assembly linker (AL.exe), discussed later) so that the data file is considered to be part of the assembly. By the way, this data file can be in any format: a text file, a Microsoft Excel spreadsheet, a Microsoft Word table, or whatever you like as long as your application knows how to parse the file s contents. You can create assemblies consisting of types implemented in different programming languages. When you compile C# source code, the compiler produces a module. When you compile Visual Basic source code, the compiler produces a separate module. You can implement some types in C#, some types in Visual Basic, and other types in other languages. You can then use a tool to combine all these modules into a single assembly. To 48
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Installing and Configuring Windows Vista
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Figure 5-4. When a template has multiple style sheet files, you can select a specific CSS file for editing.
You ll notice that this application code references the MaxEntriesInList constant. When the compiler builds the application code, it sees that MaxEntriesInList is a constant literal with a value of 50 and embeds the Int32 value of 50 right inside the application s IL code. In fact, after building the application code, the DLL assembly isn t even loaded at run time and can be deleted from the disk. This example should make the versioning problem obvious to you. If the developer changes the MaxEntriesInList constant to 1000 and rebuilds the DLL assembly, the application code is not affected. For the application to pick up the new value, it would have to be recompiled as well. You 147
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An aggregate function does not accept a subquery as an inputfor example, HAVING SUM((SELECT ...)) > 10.
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In this project, we declare the SourceFiles item to include all les ending in .txt located in the src folder. The following image depicts the le/folder structure in which the project le is located.
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