c# qr code generator open source ASP .NET .Authentication .Services in .net C#

Use qr codes in .net C# ASP .NET .Authentication .Services

WITH YearlyCount AS ( SELECT YEAR(orderdate) AS orderyear, COUNT(DISTINCT custid) AS numcusts FROM Sales.Orders GROUP BY YEAR(orderdate) ) SELECT Cur.orderyear, Cur.numcusts AS curnumcusts, Prv.numcusts AS prvnumcusts, Cur.numcusts - Prv.numcusts AS growth FROM YearlyCount AS Cur LEFT OUTER JOIN YearlyCount AS Prv ON Cur.orderyear = Prv.orderyear + 1;

When a type is designed, the developer must make the conscious decision as to whether or not to allow instances of the type to be serializable . By default, types are not serializable . For example, the following code does not perform as expected:

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the x variable will change from 0x00000000 to 0x01234567 all at once (atomically) . Another thread cannot possibly see the value in an intermediate state . For example, it is impossible for some other read to query SomeType.x and get a value of 0x01230000 . However, while the reads and writes to a properly aligned variable are guaranteed to happen all at once, you are not guaranteed when they happen due to compiler and CPU optimizations . The volatile constructs ensure that the read or write operation is atomic and, more importantly, they also control the timing of these atomic operations . The interlocked constructs can perform operations that are slightly more complex than simple read and write operations, and they also control the timing of these operations . Suppose that the x field in the SomeType class above is an Int64 that is not properly aligned . If a thread executes this line of code:

8. Click the Dial button. The Connecting MyCompany message box displays the status of the connection. After the configured phone number is dialed, the telephone rings twice, and the Routing And Remote Access service on Computer1 answers. The user name and password are verified, and then the computer is registered on the network. Finally, the Connecting MyCompany message box closes, and domain logon pro ceeds using the supplied credentials. 9. Once domain logon of User1 has completed, open a Microsoft Internet Explorer window. Dismiss any messages or warnings that you receive. 10. In the Address text box, type \\computer1.domain1.local, and then press Enter. The shares available on Computer1 appear in the Internet Explorer window, which demonstrates that User1 has successfully connected to Computer1 over a dial-up connection. 11. Close Internet Explorer, and then log off Computer2.

In most dynamically extensible applications, Assembly s Load method is the preferred way of loading an assembly into an AppDomain . However, it does require that you have all of the pieces that make up an assembly s identity . Frequently, developers write tools or utilities (such as ILDasm .exe, PEVerify .exe, CorFlags .exe, GACUtil .exe, SGen .exe, SN .exe, XSD .exe) that perform some kind of processing on an assembly . All of these tools take a command-line argument that refers to the path name of an assembly file (including file extension) . To load an assembly specifying a path name, you call Assembly s LoadFrom method:

ASP.NET includes a CompareValidator control to compare two values. Using a CompareValidator control could be useful for creating, for example, a password change page, on which the new password must be entered correctly twice to ensure that the password is set to the value the user intended. Suppose that we wanted to use the CompareValidator control rather than the Login_Click server-side logic. For the password, we could change the RequiredFieldValidator control to a CompareValidator control, as follows: <asp:CompareValidator id="comp1" ControlToValidate="UserPass" ValueToCompare = "password" Type="String" runat="server"/> The ValueToCompare attribute is one way to specify what is to be compared in a CompareValidator control, but another possible way is to use the CompareToControl attribute. Set this attribute to the ID of another control on the form, and the CompareValidator control will instead compare the value of the ControlToValidate attribute to the value of the control pointed to by CompareToControl. If you use the ValueToCompare attribute, an unfortunate side effect can occur. For example, if you use the previous CompareValidator code, the following code would replace the CompareValidator code and be returned to the client: <span id="comp1" controltovalidate="UserPass" evaluationfunction="CompareValidatorEvaluateIsValid" valuetocompare="password" style="color:Red;visibility:hidden;"></span> This is almost certainly not what you would want to do. In the generated HTML returned to the client browser, the <SPAN> tag contains, in clear text, the ValueToCompare attribute. This example is obviously contrived, but in the real world, you ll certainly encounter situations in which you d prefer not to expose so much to the client. One solution is to change the clienttarget attribute of the Page directive. Listing 5-1 didn t have a Page directive, but you could add the following line: <%@ Page Language="c#" clienttarget=downlevel %> When this directive is added to the Login.aspx code shown in Listing 5-1, rather than the HTML code shown in Listing 5-2, the browser sees the code shown in Listing 5-3. Listing 5-3 The HTML sent to the browser when Login.aspx in Listing 5-1 has the clienttarget=downlevel attribute added to the Page directive