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The next line takes the same approach, but avoids the need for an extra variable by calling the GetOrdinal() method from inside the GetDateTime() method call: ' Avoid using the pos variable altogether, ' but get the typed value txtBirthText = readerGetDateTime( _ readerGetOrdinal("DateOfBirth"))ToShortDateString() This reduces the amount of code you need to write, at the expense of a little added complexity Because the value returned is a typed DateTime object, you can use its methods to format the date The following lines show the most common approach, where you simply use the data reader object s default property, which receives the column name and returns an Object You can convert this object to a string very easily indeed: ' Convert directly the untyped Object returned by the ' default property to a string txtEmailText = reader("Email")ToString() txtFNameText = reader("FirstName")ToString() txtLName.

4. You have the Default.aspx page set up; repeat steps 1 through 3 for the remaining Web Forms AboutUs.aspx, ContactUs.aspx, and Products.aspx. 5. You are now ready to build and run the web project and see the Treeview control in action (Figures 7-8 and 7-9). To do so, press the F5 function key or click the green start arrow from the menu. Notice how the SiteMapPath control only displays the current page. When navigating to another page via the Treeview control, the SiteMapPath control will display the breadcrumb trail of where you have been within the site.

Figure 11-7. Error in error message This, however, is not entirely accurate, since you may have created your own rendering template. The reason why "TextField" is used, however, is that you are inheriting the CreateChildControls from the parent, and the parent has hard-coded the name of its rendering template into the error message.

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Text = reader("LastName")ToString() txtLoginText = reader("Login")ToString() txtPhoneText = reader("PhoneNumber")ToString() txtPwdText = reader("Password")ToString() The last bit of code is a peek at the extra features you can get from a SqlDataReader object Accessing the native data types of a SQL Server database can improve application performance, since by doing so, you avoid the conversion between SQL Server data types and NET data types However, this does make it harder to change the data provider if you decide to use a different database in the future In this block, you use the SqlString type, which has (among other things) an IsNull property that can tell you whether a value is present: ' Use SQL Server type to have additional features pos = readerGetOrdinal("CellNumber") Dim cel As SqlString = readerGetSqlString(pos) If Not celIsNull Then txtMobileText = cel.

Value When the user clicks the Accept button, you check the IsAuthenticated property and call the update or the insert method accordingly: If ContextUserIdentityIsAuthenticated Then UpdateUser() Else InsertUser() End If If you compare the code for the UpdateUser() method with that for the insert method that you created earlier, you will find that the two are almost identical The only difference lies in the SQL statement building process, so we don t need to go any deeper there..

Figure 7-9. Navigating the Treeview control Congratulations! You have now added simple site navigation to your Web project.

Remember that we discussed render patterns in 9 You may or may not want to edit these patterns for your field type. If you do, you can opt to just override the default DisplayPattern by adding a RenderPattern element to your field type definition: <Field Name="TypeName">TimesType</Field> <RenderPattern Name="DisplayPattern"> <HTML><![CDATA[<span style="font-size:large;color:red;">]]></HTML> <Column/> <HTML><![CDATA[</span>]]></HTML> </RenderPattern> </FieldType> However, you will quickly find that you get no IntelliSense. I know that being hard-core is sometimes a cool thing, but writing CAML view schema without IntelliSense is just madness. To help out, however, open one of your list templates, and write your code inside a view where the IntelliSense will work and give you plenty of support.

Until now, we ve been looking at a connected model for accessing a database; that is, your code retains a connection to the database for the duration of your interactions with it. Data reader objects are very useful if you just need to move forward through the results of a query and display some values quickly, but an open connection is a valuable resource. Also, if you need to pass the retrieved data between methods, perform some processing before displaying it, or move back and forth through the results, a data reader simply doesn t cut the mustard. What you need is some way to extract data from the database on a semipermanent basis, so that you can close the database connection for a while and manipulate the data as you see fit. In other words, you need a way to deal with data that s disconnected from the data source.

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