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The problem is that the list is shared between the two threads. Imagine that there are two threads running the code, T1 and T2. T1 checks the Count property of the list and returns the value 1. At this point, the operating system halts execution of T1 and switches execution to T2. T2 now checks the value of Count and also receives the value 1. T2 continues execution into the if statement and removes the first string in the list. T1 takes over at this point and also continues execution into the if statement because it previously received a value of true from the boolean condition. It also tries to remove the first element of the list, but it has already been removed. The code throws an ArgumentOutOfRangeException and crashes. To prevent a race condition, a lock can be taken around a block of code, which ensures that access is limited to one thread at a time, as shown in Listing 4 23. Listing 4 23. Adding Locks to Prevent Concurrent Access object lockObj = new object(); IList<string> list = new List<string>(); list.Add("Hello"); // multi-threaded code lock(lockObj) { if(list.Count > 0) { list.RemoveAt(0); } } The list is now protected from concurrent access. The if statement and the RemoveAt call are considered to be an atomic action that a thread must complete in its entirety before another thread can gain a lock on the lockObj. The question now is, What has threading gained us except for a headache It is extremely important that code is multi-threaded only when there is a proven requirement to do so.

The GridView is a class that derives from ViewBase and represents a list view with multiple columns. You define those columns by adding GridViewColumn objects to the GridView.Columns collection. Both GridView and GridViewColumn provide a small set of useful methods that you can use to customize the appearance of your list. To create the simplest, most straightforward list (which resembles the details view in Windows Explorer), you need to set just two properties for each GridViewColumn: Header and DisplayMemberBinding. The Header property supplies the text that s placed at the top of the column. The DisplayMemberBinding property contains a binding that extracts the piece of information you want to display from each data item. Figure 22-1 shows a straightforward example with three columns of information about a product.

Here s the markup that defines the three columns used in this example: <ListView Margin="5" Name="lstProducts"> <ListView.View> <GridView> <GridView.Columns> <GridViewColumn Header="Name"

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DisplayMemberBinding="{Binding Path=ModelName}" /> <GridViewColumn Header="Model" DisplayMemberBinding="{Binding Path=ModelNumber}" /> <GridViewColumn Header="Price" DisplayMemberBinding= "{Binding Path=UnitCost, StringFormat={}{0:C}}" /> </GridView.Columns> </GridView> </ListView.View> </ListView> This example has a few important points worth noticing. First, none of the columns has a hardcoded size. Instead, the GridView sizes its columns just large enough to fit the widest visible item (or the column header, if it s wider), which makes a lot of sense in the flow layout world of WPF. (Of course, this leaves you in a bit of trouble if you have huge columns values. In this case, you may choose to wrap your text, as described in the upcoming Cell Templates section.) Also, notice how the DisplayMemberBinding property is set using a full-fledged binding expression, which supports all the tricks you learned about in 20, including string formatting and value converters.

Initially, the GridView makes each column just wide enough to fit the largest visible value. However, you can easily resize any column by clicking and dragging the edge of the column header. Or, you can double-click the edge of the column header to force the GridViewColumn to resize itself based on whatever content is currently visible. For example, if you scroll down the list and find an item that s truncated because it s wider than the column, just double-click the right edge of that column s header. The column will automatically expand itself to fit. For more micromanaged control over column size, you can set a specific width when you declare the column: <GridViewColumn Width="300" ... /> This simply determines the initial size of the column. It doesn t prevent the user from resizing the column using either of the techniques described previously. Unfortunately, the GridViewColumn class doesn t define properties like MaxWidth and MinWidth, so there s no way to constrain how a column can be resized. Your only option is to supply a new template for the GridViewColumn s header if you want to disable resizing altogether.

VeriSign currently has a service in beta called the Personal Identity Provider (PIP), as shown in Figure 4-6. PIP allows individuals to sign up for an identity. This service is built on open standards such as Yadis and OpenID.

The GridViewColumn.DisplayMemberBinding property isn t the only option for showing data in a cell. Your other choice is the CellTemplate property, which takes a data template. This is exactly like the data templates you learned about in 20, except it applies to just one column. If you re ambitious, you can give each column its own data template.

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