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private bool isUpdating; // Triggered in response to the TextBox1.TextChanged event. private void textBox1_TextChanged(object sender, System.EventArgs e) { // The reference to the MDI parent must be converted to the appropriate // form class to access the custom RefreshChildren() method. Parent parent = base.MdiParent as Parent; if (parent != null && !isUpdating) { parent.RefreshChildren(this, textBox1.Text); } } The RefreshChildren() method in the MDI parent form steps through all the child windows and updates each one, except the original sender. It also stores the current text in a private member variable, so it can assign it automatically to newly created windows. private string synchronizedText; public void RefreshChildren(Child sender, string text) { // Store text for use when creating a child form, or if needed later. synchronizedText = text; // Update children. foreach (Child frm in this.MdiChildren) { if (frm != sender) { frm.RefreshText(text); } } } The refreshing is performed through the RefreshText() method provided by each child window. It takes special care to avoid triggering another refresh by disabling the event handler for the duration of the task. public void RefreshText(string text) { // Disable the event to prevent an endless string of updates. isUpdating = true; // Update the control. textBox1.Text = text;

// Reenable the event handler. isUpdating = false; } Finally, when the parent creates a new child window, it sets the last synchronized text into the text box using this line of code: frmChild.RefreshText(synchronizedText); This example shows how synchronization can be implemented using the MdiChildren property. However, the potential drawback of this technique is that it forces every window to be updated even if the change only affects one or two. This is suitable if all windows are linked together, but is not useful if the user is working in multiple independent windows. A more scalable approach is introduced later when you explore document-view architecture.

If you are concerned about password security, you can also change the password complexity rules to Tip

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printfn "(sqrt 16.0): %f" (sqrt 16.0) printfn "(log 160.0): %f" (log 160.0) printfn "(cos 1.6): %f" (cos 1.6) The results of this code, when compiled and executed, are as follows: (sqrt 16.0): 4.000000 (log 160.0): 5.075174 (cos 1.6): -0.029200 Table 7-1. Arithmetic Functions for Floating-Point Numbers

By convention, MDI applications often provide a menu that lists all the open document windows, and provides options for automatically tiling or cascading them. Adding these features in .NET is easy. To create an MDI child window list, simply add a MenuStrip, and then insert one ToolStripMenuItem for the list. Typically, this ToolStripMenuItem will display the text &Window . Once you ve created this menu item, set the MenuStrip.MdiWindowListItem to the top-level ToolStripMenuItem you created. You can perform this step using the Properties window, which will give you a drop-down list of all the ToolStripMenuItem objects that are a part of the menu. Once you ve established this link, the Windows Forms engine automatically adds one item to the bottom of the submenu for each child window (using the title bar for the menu text) and places a check mark next to the window that is currently active (see Figure 19-6). The user also can use the menu to move from window to window, without any required code.

When you place more than one control in the same place, one will end up on top, and the other will end up underneath. Usually this is the result of a minor mistake, such as incorrectly using the anchoring and docking features (described in 3) to create resizable forms. In some cases, however, you might want to overlap controls for a specific effect. When controls overlap, it s the z-index that determines which control ends up on top. Essentially, every control exists in its own distinct numbered layer. A control that has the z-index

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