dotnet core barcode generator

.net core barcode generator

.net core barcode

Instead of typing the location in hand, you can click the Browse button, which shows the Choose Location dialog box Along the left side of Choose Location dialog box you ll see four buttons that let you connect to different types of locations: File System: This is the easiest choice you simply need to browse through a tree of drives and directories or through the shares provided by other computers on the network If you want to create a new directory for your application, just click the Create New Folder icon above the topright corner of the directory tree (You can also coax Visual Studio into creating a directory by adding a new directory name to the end of your path) Local IIS: This choice allows you to browse the virtual directories made available through the IIS web hosting software, assuming it s running on the current computer.

Figure 9-13. Data binding with extra options So, how can you implement this model with data binding One of the few weaknesses in the data binding model is that you never explicitly handle or create the data object that s bound to the control. As a result, you don t have the chance to add an extra item. In fact, this example has two challenges determining how to add the extra options to the list and reacting when they are selected to override the automatic query logic.

As a whole, the data source controls are a remarkable innovation for ASP.NET developers. However, you ll still run into situations where you need to step beyond their bounds or even abandon them completely. In the following sections, you ll see how to use the SqlDataSource and ObjectDataSource to deal with a common design requirement additional options in a master-details list.

18 describes virtual directories in detail and shows you how to create them with IIS Manager Impressively, you can also create them in Visual Studio using the Create New Web Application icon at the top-right corner of the virtual directory tree FTP Site: This option isn t quite as convenient as browsing for a directory instead, you ll need to enter all the connection information, including the FTP site, the port, the directory, a user name, and a password before you can connect Remote Web Server: This option accesses a website at a specified URL (uniform resource locator) using HTTP For this to work, the web server must have the FrontPage Extensions installed When you connect, you ll be prompted for a user name and password Figure 2-2 shows all these location types..

This problem has a few possible workarounds, but none is perfect. You could rewrite the query so that it returns a result set with an extra hard-coded item. Here s an example: SELECT '(Choose a City)' AS City UNION SELECT DISTINCT City FROM Employees The problem with this approach is that it forces you to add presentation details to the data layer. If your query is in a dedicated stored procedure (which is always a good idea), it will be difficult to reuse this query for other purposes, and it will be awkward to maintain the page. A better choice is to insert this fixed piece of string into the DropDownList programmatically. However, you can t take this step before the data binding takes place, because the data binding process will wipe it from the list. You could override the Page.OnPreRenderComplete() method to perform this task. However, that raises new complications. For one thing, the GridView will have already been filled with data based on the initial DropDownList selection. (Even if you solve this problem, there are other issues related to how changes are detected in the DropDownList selection.) Ultimately, you ll need to resort to programmatic data binding. In normal operation, data source controls are invoked automatically when a linked control needs data or is ready to commit