code 39 barcode generator vb.net s CREATING YOUR OWN TEMPLATES in visual basic

Implement Code 39 Full ASCII in visual basic s CREATING YOUR OWN TEMPLATES

// One type allows equality and assignment operations. Console.WriteLine("Objects are equal: " + o1.Equals(o2)); o1 = o2; // Assignment

<div id="silverlightControlHost"> <object data="data:application/x-silverlight," type="application/x-silverlight-2" width="100%" height="100%"> <param name="source" value="ClientBin/SilverlightApplication1.xap"/> <param name="onerror" value="onSilverlightError" /> <param name="background" value="white" /> <param name="minRuntimeVersion" value="2.0.31005.0" /> <param name="autoUpgrade" value="true" /> <a href="http://go.microsoft.com/fwlink/ LinkID=124807" style="text-decoration: none;"> <img src="http://go.microsoft.com/fwlink/ LinkId=108181" alt="Get Microsoft Silverlight" style="border-style: none"/> </a> </object> <iframe style='visibility:hidden;height:0;width:0;border:0px'></iframe> </div> </body>

There are several advantages to using factored subqueries. First, they can make development easier by isolating each query (as I will show in Listing 9-18). Second, they make the code clearer. Using the previous example would look as follows: select ... from (select ... from (select ... from (select ... from ...) v3 ) v2 ) v1 When there is a problem with the query, it can be difficult to locate the actual problem. By using subquery factoring, you can create the subquery as a standalone query, then make it a factored subquery using WITH, SELECT * from it to check for completeness, and add in additional predicates, data transformations, exclude columns, and so on. If this query is also meant to be a factored subquery, you can then name it and SELECT * from it to check for completeness, add in additional predicates, and so on. Listing 9-18 shows how a statement using a factored subquery can be developed using a 3 step process. Each step in Listing 9-18 is executed separately. Listing 9-18. WITH Clause Development Example select , from group by x.deptno avg(x.msal) avg_sal employees x x.deptno; x.deptno avg(x.msal) avg_sal employees x x.deptno)

Some programmers believe that .NET Remoting is even harder to set up than DCOM. They point out that DCOM, at least, has a tool (dcomcnfg.exe) to help with the setup and configuration of remote components; .NET Remoting has no such tool (although the Control Panel applet called the .NET Framework Configuration tool [mscorcfg.msc] provides a minimal amount of configuration support). My personal opinion, however, is that the tasks required to set up a .NET Remoting application are far simpler to understand than the equivalent DCOM tasks.

Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22

. 1 . . Create a directory to hold the Web application files . Using either a command shell or Windows Explorer, create a new folder to hold the Web application files . Although the name of the directory is unimportant to Internet Information Services (IIS), call it something meaningful . This example uses c:\aspnetstepbystepexamples . 2 . . Create an application/virtual directory to hold the files . To start, you need a virtual directory in which to hold the source code . As you saw earlier when examining the Web Application architecture imposed by the Microsoft Windows environment, IIS divides the applications on your server using virtual directories . In addition to providing application management features, IIS creates a mapping between requests coming in over port 80 and some real directory on your computer . Virtual directories show IIS where to find the code you want to execute in your application . Open Control Panel, and then go to Administrative Tools and start Internet Information Services . Expand the nodes in the tree on the left side to expose the Default Web Site node under the Sites node, as shown in the following illustration:

Notice that the catch block in the previous example doesn t specify any exception type because I want to catch non CLS compliant exceptions and CLS compliant exceptions. Fortunately, C# lets me do this easily by just not specifying any exception type and by making the throw statement rethrow whatever object is caught.

The webpage is shown in Figure 4-15. When a file is selected and the Submit button is clicked, the code checks to see if a file has been uploaded. If a file has been uploaded, information about the file is placed into the Label control for display. The file is then saved to the Uploads folder. The website requires an absolute path, and MapPath performs the conversion from the relative path supplied to an absolute path. Finally, the file is saved.

You can also call an action method as part of an HTTP post. To do so, you mark the action method with the HttpPost attribute. This indicates that the action method should be called when the page is sent as a post (typically in response to a submit button action). In this case, you define a parameter to your action method by using the FormCollection namevalue collection. ASP.NET MVC will then map the posted form data to this collection. You reference each form element by name within the collection. The following code shows an example.

2

Step 3: