winforms data matrix

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winforms data matrix

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The dimensions of the rectangle are assigned, and then the rectangle is converted into a square and assigned to the variable square Using the keyword new, the area is 400, which is correct because when we ask for the dimensions of the square, we get a width of 20 Now suppose that we used the keyword override and type cast to Square The width would still be 20, but the area would be 600 And if we were to write tests to test the area calculation of the square, we would get a failure The shape example demonstrates that even though you think a square is like a rectangle, you can t have one derive from the other without some type of trouble Rather than being a base class, Shape should be an interface And Square is a base class for Rectangle, but each class implements the Shape interface.

Note After this change, remote clients will be forwarded to Oops.aspx when unhandled exceptions are thrown; however, on the local machine, you ll still receive detailed error information. If you want to see the same error message as your visitors, set mode to On instead of RemoteOnly.

Then we would get consistent behavior Here is the solution: interface IShape { double CalculateArea(); } class Square : IShape { double _width; public double Width { set { width = value; } get { return _width; } } public double CalculateArea() { return _width * _width; } } class Rectangle : Square, IShape { double _height; public double Height {.

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5. Add a new Web Form to your application s root, named Oops.aspx. This form should not use a Master Page, to make sure nothing gets in the way of displaying our simple error. The page also doesn t need a code-behind file. 6. While in Source View, modify its contents like this: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>BalloonShop: Oops!</title> </head> <body> <form id="form1" runat="server"> <asp:HyperLink ID="HeaderLink" ImageUrl="~/Images/BalloonShopLogo.png" NavigateUrl="~/" ToolTip="BalloonShop logo" Text="BalloonShop logo" runat="server" /> <p>Your request generated an internal error!</p> <p>We apologize for the inconvenience. The error has been reported and will be fixed as soon as possible. Thank you!</p> <p>The <b>BalloonShop</b> team</p> </form> </body> </html> 7. Finally, let s remove the text Place contents here from BalloonShop.master so that we can test our newly created error page.

By Changing Cells Must Be on the Active Sheet: This message appears if any of the cells referenced in the By Changing Cells box are not within the active worksheet To correct this problem, redesign your model so that all the changing cells are all located on the active worksheet, and try running Solver again Cannot Guess By Changing Cells Without a Set Cell: This message appears if you click the Guess button without first referencing a cell in the Set Target Cell box To correct this problem, click the Set Target Cell box and type or click the problem s target cell Cell Reference Box Is Empty or Contents Are Not Valid: This message appears in the Add/ Change Constraint dialog box if you click OK and the Cell Reference box is empty or contains something other than a valid cell reference.

set { height = value; } get { return _height; } } public new double CalculateArea() { return Width * _height; } } This modification of the inheritance using both interfaces and classes will result in a consistent CalculateArea, regardless of how an instance of Rectangle is cast. Following is the code that we could execute to verify that there are no consistency problems. Rectangle rectangle = new Rectangle(); rectangle.Height = 30; rectangle.Width = 20; Square square = rectangle; IShape shapeCastFromRectangle = rectangle; IShape shapeCastFromSquare = square; Console.WriteLine("Area Rectangle (" + rectangle.CalculateArea() + ") Area Square (" + square.CalculateArea() + ") Area Cast From Rectangle (" + shapeCastFromRectangle.CalculateArea() + ") Area Cast From Square (" + shapeCastFromSquare.CalculateArea() + ")"); The various techniques used in this example are explained in the remainder of this chapter.

Right now, your web site, no matter what happens, will look good. In case of an error, instead of displaying the default error message (which is, of course, not colorful enough for our customers tastes), it will display a nicelooking error message page.

Note The example illustrates that by using inheritance, you can downcast a type and get the appropriate

For a short test, open web.config and edit the database connection password from the connection string. Now, trying to load BalloonShop without debugging (Ctrl+F5) generates a runtime exception. Have a look at the custom error page in Figure 4-24.

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