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So the .NET Framework now ships with 17 Action delegates that range from having no arguments to having 16 arguments . If you ever need to call a method that has more than 16 arguments, you will be forced to define your own delegate type, but this is very unlikely . In addition to the Action delegates, the .NET Framework ships with 17 Func delegates, which allow the callback method to return a value:

Windows operating system never detects that a thread is blocked on a primitive user-mode construct Since a thread pool thread blocked on a user-mode primitive construct is never considered blocked, the thread pool will not create a new thread to replace the temporarily blocked thread In addition, these CPU instructions block the thread for an incredibly short period of time Wow! All of this sounds great, doesn t it And it is great, which is why I recommend using these constructs as much as possible However, there is a downside: Only the Windows operating system kernel can stop a thread from running so that it is not wasting CPU time A thread running in user mode can be preempted by the system, but the thread will be scheduled again as soon as possible .

In the previous couple of chapters, we looked at some basic programming techniques such as loops and conditions, and used some of the data types built into the language and platform, such as int and string. Unfortunately, real programs even fairly simple ones are much, much more complicated than the examples we ve built so far. They need to model the behavior of realworld objects like cars and planes, or ideas like mathematical expressions, or behaviors, like the transaction between you and your favorite coffee shop when you buy a double espresso and a brownie with your bank card.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="AddressUserControl.ascx.cs" Inherits="AddressUserControl" %> <div> Address <br /> <asp:TextBox ID="TextBoxAddress" runat="server" Width="325px" Height="80px" TextMode="MultiLine"></asp:TextBox> <div style="width: 450px"> <div style="float: left; margin-right: 3px"> City <br /> <asp:TextBox ID="TextBoxCity" runat="server" Width="150"></asp:TextBox> </div> <div style="float: left; margin-right: 3px"> State / Province <br /> <asp:TextBox ID="TextBoxStateProv" runat="server" Width="80"></asp:TextBox> </div> <div style="float: left"> Postal Code <br /> <asp:TextBox ID="TextBoxPostalCode" runat="server" Width="70"></asp:TextBox> </div> </div> <asp:Button ID="ButtonSave" runat="server" Text="Save" onclick="ButtonSave_Click" /> </div>

So a thread that wants to acquire some resource but can t get it spins in user mode This potentially wastes a lot of CPU time, which would be better spent performing other work or even just letting the CPU go idle to conserve power This brings us to the primitive kernel-mode constructs The kernel-mode constructs are provided by the Windows operating system itself As such, they require that your application s threads call functions implemented in the operating system kernel Having threads transition from user mode to kernel mode and back incurs a big performance hit, which is why kernelmode constructs should be avoided 2 However, they do have a positive feature: When a thread uses a kernel-mode construct to acquire a resource that another thread has, Windows blocks the thread so that it is no longer wasting CPU time .

Installing a Certificate on IIS7 for remote access to Remote Web Workplace with a public certificate. Disabling SSLv2 to comply with PCI/DSS standards. Adjusting VPN to support more secure protocols. Changing remote desktop to support Network Level Authentication. Recommended firewall settings. WMI query tips.

Then, when the resource becomes available, Windows resumes the thread, allowing it to access the resource A thread waiting on a construct might block forever if the thread currently holding the construct never releases it If the construct is a user-mode construct, the thread is running on a CPU forever, and we call this a livelock If the construct is a kernel-mode construct, the thread is blocked forever, and we call this a deadlock Both of these are bad, but of the two, a deadlock is always preferable to a livelock because a livelock wastes both CPU time and memory (the thread s stack, etc ), while a deadlock wastes only memory 3 In an ideal world, we d like to have constructs that take the best of both worlds .