how to generate barcode in asp net core

how to generate barcode in asp net core

how to generate barcode in asp net core

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When a session is initialized, the server groups a set of requests together using a session ID, a database, or a cookie. Whatever the method, the idea behind the session is that the server can maintain a pseudoconnection with the user, even though the communication could get interrupted along the way. You ve run into this when you ve logged into your web-based e-mail account or some similar web service. The site application knows that you re logged in and maintains that status until you log out or a certain length of inactivity transpires. Luckily, Cake makes session handling easy. But you need to make sure that its session string is secure. You wouldn t want any users to toy with the session handling in an effort to break into your applications. To add some security to the session variables, open the app/config/core.php file, and locate line 153, or thereabouts. You ll find a line that looks like this: Configure::write('Security.salt', 'DYhG93b0qyJfIxfs2guVoUubWwvniR2G0FgaC9mi'); This line is how Cake writes definitions. Rather than use the PHP define() function, Cake s core configuration uses the Configure::write() function to better manage global

<asp:LinkButton ID="lnkFurniture" runat="server" CommandArgument="Menu2Host.aspx product=Furniture"> Furniture</asp:LinkButton> you can pass the link along to the web page like this: Dim args As New LinkClickedEventArgs(e.CommandArgument) RaiseEvent LinkClicked(Me, args) Here s the complete user control code. It implements one more feature. After the event has been raised and handled by the web page, the LinkMenu2 checks the Cancel property. If it s False, it goes ahead and performs the redirect using Reponse.Redirect(). Public Partial Class LinkMenu2 Inherits System.Web.UI.UserControl Public Event LinkClicked(ByVal sender As Object, _ ByVal e As LinkClickedEventArgs) Protected Sub lnk_Click(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.CommandEventArgs) Handles _ lnkBooks.Click, lnkToys.Click, lnkSports.Click, lnkFurniture.Click ' One of the LinkButton controls has been clicked. ' Raise an event to the page. ' Pass along the link information. Dim args As New LinkClickedEventArgs(e.CommandArgument) RaiseEvent LinkClicked(Me, args) ' Perform the redirect. If Not args.Cancel Then ' Notice this code uses the Url from the LinkClickedEventArgs ' object, not the original link. That means the web page ' can change the link if desired before the redirect. Response.Redirect(args.Url) End If End Sub End Class Finally, you need to update the code in the web page (where the user control is placed) so that its event handler uses the new signature. In the following code, the LinkClicked event handler checks the URL and allows it in all cases except one: Protected Sub Menu1_LinkClicked(ByVal sender As Object, _ ByVal e As LinkClickedEventArgs) Handles Menu1.LinkClicked

If e.Url = "Menu2Host.aspx product=Furniture" Then lblClick.Text = "This link is not allowed." e.Cancel = True Else ' Allow the redirect, and don't make any changes to the URL. End If End Sub If you click the Furniture link, you ll see the message shown in Figure 12-6.

One of the features of the .NET Framework is GDI+, a set of classes designed for drawing images. You can use GDI+ in a Windows or an ASP.NET application to create dynamic graphics. In a Windows application, the graphics you draw would be copied to a window for display. In ASP.NET, the graphics can be rendered right into the HTML stream and sent directly to the client browser. In general, using GDI+ code to draw a graphic is slower than using a ready-made image file. However, GDI+ gives you much more freedom. For example, you can tailor your image to suit a particular purpose, incorporating information such as the date or current user name. You can also mingle text, shapes, and other bitmaps to create a complete picture.

Figure 2-4. A data table listing retail sales prices with discounts and sales tax added (panes split for readability)

server memory for each action the application performs. That can add up quickly if too many helpers are called for the whole site. Because PHP code is parsed and compiled each time it is accessed, anything you can do to reduce the amount of code will help site performance. Using code only where it is needed will also help you when troubleshooting. Including too many helpers in the App controller increases server load and may necessitate adjusting PHP settings or using a runtime accelerator with PHP.