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How many boxing operations do you count in this code The answer is one . The reason that there is only one boxing operation is that the System.Console class defines a WriteLine method that accepts an Int32 as a parameter:

// The following line generates error CS1503: Argument '1': // cannot convert from 'ref SomeType' to 'ref object'. GetAnObject(out st); Console.WriteLine(st.m_val); } private static void GetAnObject(out Object o) { o = new String('X', 100); } }

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Many experienced programmers view this approach as aiding readability for the programmer who can t keep details of the programming language straight but degrading readability for the programmer who is more fluent in the language. In addition, most compilers will provide error warnings for usages of assignment and bitwise operators that seem like errors. Turning on full compiler warnings is usually a better option than creating non-standard macros.

A DataSet is a memory-based relational representation of data and is the primary disconnected data object used in many ASP.NET applications. A DataSet contains a collection of DataTable and DataRelation objects, as shown in Figure 11-2 (which was built with the DataSet designer in Visual Studio). DataSet

Each column in a table has a particular data type. By looking at the previously shown Figure 3-8 with the department table, department_id has a numeric data type, whereas name and description contain text. It s important to consider the many data types that PostgreSQL Server supports so that you ll be able to make correct decisions about how to create your tables. Table 3-1 isn t an exhaustive list of PostgreSQL data types, but it focuses on the main types you might come across in your project. Refer to the PostgreSQL documentation for a more detailed list at http://www.postgresql.org/docs/current/interactive/datatype.html.

<%@ Page Language="C#" %> <script runat="server"> protected void Page_Load(object sender, EventArgs ea) { ddl.Items.Add("Item 1"); ddl.Items.Add("Item 2"); ddl.Items.Add("Item 3"); ddl.Items.Add("Item 4"); } </script > <h2> Page in ASP.NET </h2> <form id="Form1" runat="server" > <asp:Label Text="Type in me" runat="server" /> <asp:TextBox id="textinfo" runat="server" /> <br/> <asp:DropDownList id="ddl" runat="server" /> <br/> <asp:Button id="clickme" Text="Click Me!" runat="server" /> </form>

7

Because of the high overhead of the record-by-record manipulation of the cursor, it ran for about 217 seconds against BigNumSeq on my system even though it incurred only 16,123 logical reads.

HttpChannel(IDictionary, IClientChannelSinkProvider, IServerChannelSinkProvider) TcpChannel(IDictionary, IClientChannelSinkProvider, IServerChannelSinkProvider)

var MyProfileMgrObject = Application.ProfileManager;

Boxing takes an instance of a value type and converts it to an object or interface type. For example:

IP IP is primarily responsible for addressing and routing packets between hosts. An IP packet can be lost, delivered out of sequence, duplicated, or delayed, as can information in any other protocol. However, IP itself does not attempt to recover from these types of errors. The acknowledgment of packets delivered, the sequencing of packets, and the recovery of lost packets are the responsibility of a higher-layer protocol, such as TCP.

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If you click Yes, your user name and password are encrypted, using your Windows logon credential and the website address as keys, and stored as binary data in a

Clean All In this variation the BinariesRoot, SolutionRoot, and TestResultsRoot directories are deleted from the build de nition s workspace. Clean Compilation Outputs Only In this variation the BinariesRoot and TestResultsRoot directories are deleted from the build de nition s workspace and the Clean target is then invoked for each solution/con guration combination.

Declares a new struct type, a complex C# type that has no Java equivalent. No keyword used in C#. Syntax is

[HKLM\SYSTEM\CurrentControlSet\Services\luafv\Parameters\FileList\Device\ HarddiskVolume1 \appNameX]

You can see how the ScrollViewer created here appears in Figure 2-18.

3. 4.

public sealed class ExecutionContext : IDisposable, ISerializable { [SecurityCritical] public static AsyncFlowControl SuppressFlow(); public static void RestoreFlow(); public static Boolean IsFlowSuppressed(); // Less commonly used methods are not shown }