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At first, this seems like a reasonable default implementation of Equals: it returns true if the this and obj arguments refer to the same exact object . This seems reasonable because Equals knows that an object must have the same value as itself . However, if the arguments refer to different objects, Equals can t be certain if the objects contain the same values, and therefore, false is returned . In other words, the default implementation of Object s Equals method really implements identity, not value equality . Unfortunately, as it turns out, Object s Equals method is not a reasonable default, and it should have never been implemented this way . You immediately see the problem when you

Late binding is the instantiation and manipulation of types at run time. This is most often used by scripting engines and applications that accept pluggable modules for example, an application server that allows modules to be loaded dynamically.

USE InsideTSQL2008; GO CREATE TABLE dbo.VisioDocs ( id INT NOT NULL, doc XML NOT NULL ); GO INSERT INTO dbo.VisioDocs (id, doc) SELECT 1, * FROM OPENROWSET(BULK 'C:\InsideTSQL2008\VisioFiles\ProductER.vdx', SINGLE_BLOB) AS x; INSERT INTO dbo.VisioDocs (id, doc) SELECT 2, * FROM OPENROWSET(BULK 'C:\InsideTSQL2008\VisioFiles\ProductUML.vdx', SINGLE_BLOB) AS x; INSERT INTO dbo.VisioDocs (id, doc) SELECT 3, * FROM OPENROWSET(BULK 'C:\InsideTSQL2008\VisioFiles\CustomerER.vdx', SINGLE_BLOB) AS x;

"MyTypes, Version=1.0.8123.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" "MyTypes, Version=1.0.8123.0, Culture="en-US", PublicKeyToken=b77a5c561934e089" "MyTypes, Version=2.0.1234.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" "MyTypes, Version=1.0.8123.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

If we try to execute a spatial operation against this instance for example, a test to see whether a point intersects it we get an error:

To configure a local TCP/IP connection for APIPA, complete the following steps: 1. Open Network Connections, right-click the appropriate network connection, and then select Properties. 2. In the General tab, select the Internet Protocol (TCP/IP) component, and then click Properties. The Internet Protocol (TCP/IP) Properties dialog box appears. 3. In the General tab, select Obtain An IP Address Automatically. 4. In the Alternate Configuration tab, select Automatic Private IP Address. Click OK.

TRUST 2 3 MAP THE CLAIMS ISSUER FP a ORDER WCF TRUST REQUEST AN ADATUM TOKEN 4 GET ORDERS ORDER TRACKING WEB SERVICE

Layout View is a WYSIWYG (what you see is what you get) view that enables you to make changes to a form or report and immediately see the effects of your changes. If necessary, change to Layout View by clicking the View control and choosing Layout View. The elements in the data table or form become selectable you can drag and drop them to new locations on the page, edit the content and placement of labels and field names, and change the format and spacing of headers, row dividers, logos, and more (see Figure 9-10).

using System; using System.IO; public sealed class SomeType { private void SomeMethod() { FileStream fs = new FileStream(@"C:\Data.bin ", FileMode.Open); try { // Display 100 divided by the first byte in the file. Console.WriteLine(100 / fs.ReadByte()); } finally { // Put cleanup code in a finally block to ensure that the file gets closed regardless // of whether or not an exception occurs (for example, the first byte was 0). if (fs != null) fs.Dispose(); } } }

30

Summary

means the following: If it is true that the value in cell P22 is greater than or equal to the value in cell Q22 and if it is also true that the value in cell rL1.ScrollTopicSel is equal to the value in cell G22, then use the value from P22 . Otherwise write #N/A . Thus, the values are compared but the program also is checking whether its possible result is relevant for the display . Relevant in this context means that the possible result is only supposed to be displayed if its position corresponds to the selection that the user defined via the control .

3

public void doSomething() { lock (this) { // some synchronized operation } }

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In the following exercise, you ll quickly implement a simple shopping cart administration page, where the administrator can see how many old shopping cart entries exist, and can delete them if he or she wants to. Figure 8-5 shows this page.