winforms code 39

winforms code 39

winforms code 39

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You can cut the event handler method name out of the <script> tag before you delete it and paste it in the C++/CLI code-behind to save time and to ensure you spelled it correctly.

3. Add a second zone and rename it to CIZ (for corporate intranet zone), as shown in Figure 9-18. You can simply copy your DMZ zone and paste it back onto the design surface. Change the zone and endpoint names to CIZ and CIZ_ZEP, respectively.

Next, we want to make sure we have a default value for the font, so add a line to viewDidLoad, like this:

Listing 16-14. The Code-Behind ChangeColor.aspx.h #pragma once using namespace System; using namespace System::Drawing; using namespace System::Web::UI::WebControls; namespace WebControl { public ref class ChangeColor : public System::Web::UI::Page { protected: TextBox^ tbChanger; void tbChanger_TextChanged(Object ^sender, EventArgs ^e); }; } Listing 16-15. The Code-Behind ChangeColor.aspx.cpp #include "StdAfx.h" #include "ChangeColor.aspx.h" namespace WebControl { void ChangeColor::tbChanger_TextChanged(Object ^sender, EventArgs ^e) { array<Char>^ AComma = {','}; // parse out the colors array<String^>^ incolors = tbChanger->Text->Split(AComma); // change the foreground and background tbChanger->ForeColor = Color::FromName(incolors[0]); if (incolors->Length > 1) tbChanger->BackColor = Color::FromName(incolors[1]); } }

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Because the preceding example was only one control, you could have written the code-behind using a Page_Load() method as you did in the previous example. This method makes more logical sense as you are capturing the change of the text in the TextBox, so why not use the correct event Notice that you declare the handler and implement it. The linking of the event to the Web page is handled for you somewhere deep in the generated code of the ASPX page. By the way, the if statement checking the number of colors entered into the TextBox avoids an exception being thrown. I found this out the hard way. Figure 16-7 shows in black-and-white the TextBox with yellow text and a blue background. (Guess you will have to take my word for it.)

As you ve learned, constraints are used to enforce requirements in one layer of the distributed systems model (such as the Application Designer) against those in another layer (such as the Logical Datacenter Designer). You can think of these constraints as house rules. Some households have a rule that requires you to take your shoes off at the door, and there is even a little sign posted in the entryway:

Entering text definitely has its place, but a mouse click response is a much preferred way of providing input from the user s perspective It s quick and simple, and the user s hand doesn t have to leave the mouse Of course, you can t always provide mouse click responses for everything, but when you do, ASPNET provides four buttons, a hyperlink, and a button that looks like a hyperlink from which you can choose: Button displays a push button to the user This Web control is highly configurable to the point where you can change it to look like just a simple label on the Web Form CheckBox displays a single check box that allows the user to select either a true or a false condition Note that this differs from a Win Form s CheckBox in that there is no Indeterminate state option.

- (void)viewDidLoad { [super viewDidLoad]; self.currentTool = [DotTool sharedDotTool]; [dotButton setImage:[UIImage imageNamed:@"button_dot_selected.png"]]; self.fillColor = [UIColor colorWithWhite:0.0 alpha:0.25]; self.strokeColor = [UIColor blackColor]; self.font = [UIFont systemFontOfSize:24.0]; }

Like the TextBox, the CheckBox s state is retained throughout the Web Form s session, unless the EnableViewState property is set to false (something very seldom done) ImageButton displays a push button to the user, but instead of text, the button displays an image RadioButton displays a single radio button that the user can then select If the buttons are grouped logically by sharing the same GroupName property, the user can select one radio button within the group and have all the others clear automatically HyperLink displays a control that provides a link to another location in the current page or to a different Web page Normally, you display the HyperLink as text by specifying the Text property You can also display it as an image by specifying the ImageUrl property If you specify both the Text and ImageUrl properties, ImageUrl takes precedence.

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