winforms data matrix

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winforms data matrix

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6. Add the following content to the second placeholder: <asp:Content ID="Content2" ContentPlaceHolderID="adminPlaceHolder" runat="Server"> <p> <asp:Label ID="countLabel" runat="server">Hello! </asp:Label></p> <p> <span>How many days </span> <asp:DropDownList ID="daysList" runat="server"> <asp:ListItem Value="0">All shopping carts</asp:ListItem> <asp:ListItem Value="1">One</asp:ListItem> <asp:ListItem Value="10" Selected="True">Ten</asp:ListItem> <asp:ListItem Value="20">Twenty</asp:ListItem> <asp:ListItem Value="30">Thirty</asp:ListItem> <asp:ListItem Value="90">Ninety</asp:ListItem> </asp:DropDownList> </p> <p> <asp:Button ID="countButton" runat="server" Text="Count Old Shopping Carts" /> <asp:Button ID="deleteButton" runat="server" Text="Delete Old Shopping Carts" /> </p> </asp:Content> Now if you switch to Design View, you should see a form like the one shown in Figure 13-11.

In the threading example, the threads did not manage any state. In most cases, your threads will reference some state. Using state in the context of anonymous methods and lambda expressions poses a challenge. (See 11 for details on how state is managed with lambda expressions.)

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Double-click the Delete Old Shopping Carts button, and complete its Click event handler with the following code: // deletes old shopping carts protected void deleteButton_Click(object sender, EventArgs e) { byte days = byte.Parse(daysList.SelectedItem.Value); ShoppingCartAccess.DeleteOldCarts(days); countLabel.Text = "The old shopping carts were removed from the database"; } 7. Double-click the Count Old Shopping Carts button and complete its Click event handler with the following code: // counts old shopping carts protected void countButton_Click(object sender, EventArgs e) { byte days = byte.Parse(daysList.SelectedItem.Value); int oldItems = ShoppingCartAccess.CountOldCarts(days); if (oldItems == -1) countLabel.Text = "Could not count the old shopping carts!"; else if (oldItems == 0) countLabel.Text = "There are no old shopping carts."; else countLabel.Text = "There are " + oldItems.ToString() + " old shopping carts."; } 8. To restrict this page to administrator-only access, open web.config and add the following block, after the one that deals with CatalogAdmin.aspx: <!-- Only administrators are allowed to access AdminShoppingCart.aspx --> <location path="AdminShoppingCart.aspx"> <system.web> <authorization> <allow roles="Administrators" /> <deny users="*" /> </authorization> </system.web> </location>

One way to run a thread with state is to define a type that implements a delegate of the type ThreadStart. The following example defines a class with a method that will be called by a thread. The technique used is where a classic .NET 1.x type delegate is passed to the Thread type. class ThreadedTask { string _whatToSay; public ThreadedTask(string whatosay) { _whatToSay = whatosay; } public void MethodToRun() { Console.WriteLine("I am babbling (" + _whatToSay + ")"); } }

For example, =STDEV(20,40,95,60,100) returns around 346 (dispersed from the average value of 63) STDEV assumes that the list is not the entire list of values If this list is indeed the entire list of values and not just a portion, use STDEVP instead..

9. Finally, add a link to this new page. Open UserInfo.ascx in Source View and add a link to the shopping cart admin page for the Administrators role group, just after the link to the catalog admin page: <td class="UserInfoContent"> <asp:LoginStatus ID="LoginStatus2" runat="server" /> <br /> <a href="/">BalloonShop</a> <br /> <a href="AdminDepartments.aspx">Catalog Admin</a> <br /> <a href="AdminShoppingCart.aspx">Cart Admin</a> </td>

To use the method, the threading code is changed as follows: ThreadedTask task = new ThreadedTask("hello"); Thread thread = new Thread(new ThreadStart(task.MethodToRun)); thread.Start(); In the example, the ThreadedTask type is instantiated with a state, and then Thread is instantiated with the stateful task.MethodToRun() method. When the thread starts, the data member _whatToSay will have some associated state. The code is logical and has no surprises. But what if you were to use the stateful method twice, like this: ThreadedTask task = new ThreadedTask("hello"); Thread thread1 = new Thread(new ThreadStart(task.MethodToRun)); Thread thread2 = new Thread(new ThreadStart(task.MethodToRun)); thread1.Start(); thread2.Start(); Here, there are two Thread instances, but a single task instance. There will be two threads doing the same thing, and even worse, two threads sharing the same state. It is not wrong to share state, but sharing state requires special treatment to ensure that state remains consistent. You need to instantiate a single ThreadedTask and associate it with a single Thread instance, like this: ThreadedTask task1 = new ThreadedTask("hello"); ThreadedTask task2 = new ThreadedTask("goodbye"); Thread thread1 = new Thread(new ThreadStart(task1.MethodToRun)); Thread thread2 = new Thread(new ThreadStart(task2.MethodToRun)); thread1.Start(); thread2.Start(); If you are running a stateful method, you need to associate a task instance with a thread instance. Having to associate a single task instance with a single thread instance means you can t use in-line anonymous methods that reference state. Instead, you need to use the solution demonstrated in the Using Lambda Expressions in the Spreadsheet section of 11.

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