how to generate qr code in c# web application Note viEWing AnD TROUbLEshOOTing COOkiEs in C#.NET

Printing QR-Code in C#.NET Note viEWing AnD TROUbLEshOOTing COOkiEs

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You can use Trace.axd to view cookies for every page request. For more information, see 8, Debugging and Deploying.
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Controlling Cookie Scope
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Cookies should be specific to a website s domain or a directory within that domain. The information in cookies is typically specific to that site and is often private. For this reason, a browser should not send your cookie to another site. By default, browsers will not send your cookie to a website with a different host name (although, in the past, vulnerabilities in browsers have allowed attackers to trick a browser into submitting another website s cookie). You have control over a cookie s scope. You can either limit the scope to a specific directory on your web server or expand the scope to the entire domain. The scope of your cookie determines which pages have access to the information embedded in the cookie. If you limit the scope to a directory, only pages in that directory will have access to the cookie. You control cookie scope on a per-cookie basis. To limit the scope of a cookie to a directory, you set the Path property of the HttpCookie class. The following shows sample code for doing just that.
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Sample of Visual Basic Code Response.Cookies("lastVisit").Value = DateTime.Now.ToString Response.Cookies("lastVisit").Expires = DateTime.Now.AddDays(1) Response.Cookies("lastVisit").Path = "/MyApplication" Sample of C# Code Response.Cookies["lastVisit"].Value = DateTime.Now.ToString(); Response.Cookies["lastVisit"].Expires = DateTime.Now.AddDays(1); Response.Cookies["lastVisit"].Path = "/MyApplication";
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With the scope limited to the application s /MyApplication path, the browser submits the cookie to any page in the /MyApplication folder. Pages outside of this folder do not get the cookie, even if they are on the same server.
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Lesson 2: Using Client-Side State Management
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ChAPTER 3
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To expand the scope of a cookie to an entire domain, set the Domain property of the HttpCookie class. The following code demonstrates this.
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Sample of Visual Basic Code Response.Cookies("lastVisit").Value = DateTime.Now.ToString Response.Cookies("lastVisit").Expires = DateTime.Now.AddDays(1) Response.Cookies("lastVisit").Domain = "contoso.com" Sample of C# Code Response.Cookies["lastVisit"].Value = DateTime.Now.ToString(); Response.Cookies["lastVisit"].Expires = DateTime.Now.AddDays(1); Response.Cookies["lastVisit"].Domain = "contoso.com";
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Setting the Domain property to contoso.com causes the browser to submit the cookie to any page in the contoso.com domain. This might include those pages that belong to the sites www.contoso.com, intranet.contoso.com, or private.contoso.com. Similarly, you can use the Domain property to specify a full host name (such as www.contoso.com), limiting the cookie to a specific server.
Storing Multiple Values in a Cookie
The size of your cookie is dependent on the browser. Each cookie can be up to 4 KB in length. In addition, you can typically store up to 20 cookies per site. This should be more than sufficient for most sites. However, if you need to work around the 20-cookie limit, you can store multiple values in a single cookie by setting the cookie s name and its key value. The key value is usually not used when storing just a single value. However, if you need multiple values in a single named cookie, you can add multiple keys. The following code shows an example.
Sample of Visual Basic Code Response.Cookies("info")("visit") = DateTime.Now.ToString() Response.Cookies("info")("firstName") = "Tony" Response.Cookies("info")("border") = "blue" Response.Cookies("info").Expires = DateTime.Now.AddDays(1) Sample of C# Code Response.Cookies["info"]["visit"] = DateTime.Now.ToString(); Response.Cookies["info"]["firstName"] = "Tony"; Response.Cookies["info"]["border"] = "blue"; Response.Cookies["info"].Expires = DateTime.Now.AddDays(1);
Running this code sends a single cookie to the web browser. However, that cookie is parsed to form three values. ASP.NET then reads these three values back in when the cookie is submitted back to the server. The following shows the value sent to the web browser.
(visit=4/5/2006 2:35:18 PM) (firstName=Tony) (border=blue)
Cookie properties, such as Expires, Domain, and Path, apply for all the values within a single cookie. You cannot control these at the individual key value. Rather, they are controlled at the cookie (or name) level. You can access the individual values of a cookie by using Request.Cookies in the same way you define the values (using both name and key).
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