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For the most part, HTML uses a flow-based layout. That means as more content is added, the page is reorganized and other content is bumped out the way. This layout can make it difficult to get the result you want with master pages. For example, if you aren t careful, you could craft the perfect layout, only to have the structure distorted by a huge block of information that s inserted into a <Content> tag. To control these problems, most master pages will use either HTML tables or CSS positioning to control the layout. With tables, the basic principle is to divide all or a portion of the page into columns and rows. You can then add a ContentPlaceHolder in a single cell, ensuring that the other content is aligned more or less the way you want. With CSS positioning, the idea is to separate your content into <div> tags and position these <div> tags by using absolute coordinates or by floating them on one side of the page. You ll then place the ContentPlaceHolder in the <div> tag.

4. Whenever the code is in break mode, you can hover over variables to see their current contents. This allows you to verify that variables contain the values you expect (see Figure 2-23). If you hover over an object, you can drill down into all the individual properties by clicking a small plus symbol to expand it (see Figure 2-24).

Moves to the previous view. Moves to the next view. Moves to the view with a specific ID (string name). The ID is taken from the CommandArgument property of the button control.

The following example shows how you can use master pages to create a traditional web application with a header, footer, and navigation bar, all of which are defined with tables. Figure 15-14 shows how this structure is broken up into a table.

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You can even modify the values in a variable or property directly just click inside the tooltip, and enter the new value. This allows you to simulate scenarios that are difficult or time-consuming to re-create manually or to test specific error conditions.

Moves to the view with a specific numeric index. The index is taken from the CommandArgument property of the button control.

Figure 15-14. A table-based layout Here s the markup for the table: <table width="100%"> <tr><td colspan="2">My Header</td></tr> <tr> <td width="150px">Navigation Controls</td> <td> <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </td> </tr> <tr><td colspan="2">My Footer</td></tr> </table>

5. You can also use any of the commands listed in Table 2-5 while in break mode. These commands are available from the context menu by right-clicking the code window or by using the associated hot key.

To try this, add this button to your first two views (remembering to change the ID for each one): <asp:Button ID="cmdNext" runat="server" Text="Next >" CommandName="NextView" /> And add this button to your second and third views: <asp:Button ID="cmdPrev" runat="server" Text="< Prev" CommandName="PrevView" /> Finally, make sure the drop-down list shows the correct view when you use the buttons by adding this code to handle the MultiView.ActiveViewIndexChanged event: protected void MultiView1_ActiveViewChanged(object sender, EventArgs e) { DropDownList1.SelectedIndex = MultiView1.ActiveViewIndex; } Now you can move from view to view using the buttons (see Figure 16-3).

To a quick refresher on HTML tables, complete with information about how to specify borders, cell sizes, alignment, and more, refer to the examples at http://www.w3schools.com/html/html_tables.asp.

When you create a Connection object, you need to supply a connection string. The connection string is a series of name/value settings separated by semicolons (;). The order of these settings is unimportant, as is the capitalization. Taken together, they specify the basic information needed to create a connection. Although connection strings vary based on the RDBMS and provider you are using, a few pieces of information are almost always required: The server where the database is located: In the examples in this book, the database server is always located on the same computer as the ASP.NET application, so the loopback alias localhost is used instead of a computer name. The database you want to use: Most of the examples in this book use the Northwind database, which is installed by default with most editions of SQL Server. How the database should authenticate you: The Oracle and SQL Server providers give you the choice of supplying authentication credentials or logging in as the current user. The latter choice is usually best, because you don t need to place password information in your code or configuration files. For example, here s the connection string you would use to connect to the Northwind database on the current computer using integrated security (which uses the currently logged-in Windows user to access the database):

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