vb.net code 39 generator software C10620245.fm Page 344 Thursday, June 10, 2004 12:29 PM in Visual Studio .NET

Painting Code-128 in Visual Studio .NET C10620245.fm Page 344 Thursday, June 10, 2004 12:29 PM

C10620245.fm Page 344 Thursday, June 10, 2004 12:29 PM
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Part III
Code 128 Code Set B Generator In C#.NET
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Code-128 Generation In VS .NET
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Application Services
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Table 10-12
Bar Code Creation In .NET
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Properties of the Login Control
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Description Indicates whether constituent controls should be displayed horizontally or vertically (default). Gets the password entered by the user. Gets or sets the text of the label for the Password text box. Gets or sets text of a link to the password recovery page. Gets or sets the URL to the password recovery page.
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Property Orientation Password PasswordLabelText PasswordRecoveryText PasswordRecoveryUrl
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PasswordRequiredErrorMessage Gets or sets the error message to display when the password field is left blank. RememberMeSet RememberMeText SubmitButtonImageUrl SubmitButtonStyle SubmitButtonText SubmitButtonType TextBoxStyle TitleText TitleTextStyle UserName UserNameLabelText Indicates whether the Remember Me check box is set. Gets or sets the text of the label for the Remember Me check box. Gets or sets the URL of an image to use for the submit button. Defines the style of the submit button. Gets or sets the text for the submit button. Gets or sets the type of button to use when rendering the control (push or link button). Defines the style of text boxes. Gets or sets the title of the control. Defines the style of the title text. Gets the username entered by the user. Gets or sets the text of the label for the UserName text box.
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UserNameRequiredErrorMessage Gets or sets the error message to display when the username field is left blank. VisibleWhenLoggedIn Indicates whether to show the Login form once the user is authenticated.
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If you don t like the standard user interface of the control, you can define your own template:
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<asp:login runat="server id="MyLoginForm"> <layouttemplate> </layouttemplate> </asp:login>
C10620245.fm Page 345 Thursday, June 10, 2004 12:29 PM
10
ASP.NET Security
Your template can include new elements, and you can recycle default components. To do the latter, you should use the same ID for the controls as in the default template. To simplify this operation, right-click on the control in the Visual Studio designer, choose Convert To Template, and switch to Source view. The markup you see is the default template of the control expressed as ASP.NET code. Use it as a starting point for creating your own template.
Events of the Control
The Login control fires the events listed in Table 10-13.
Table 10-13 Events of the Login Control
Event Authenticate LoggedIn LoggingIn LoginError
Description Fires when a user is authenticated. Fires when the user logs in to the site after a successful authentication. Fires when a user submits login information but before the authentication takes place. The operation can still be canceled. Fires when a login error is detected.
In most common cases, though, you don t handle any of these events. The most common use for the Login control is to set up the user interface of the login page for use with Forms authentication. The form itself performs membership authentication, displays error messages, and redirects to the originally requested page when the login is successful.
The LoginName Control
The LoginName control is an extremely simple and useful server control. It works like a sort of label control and displays the user s name on a Web page:
<asp:loginname runat="server />
The control captures the name of the currently logged-in user from the User intrinsic object and outputs it using the current style. Internally, the control builds a dynamic instance of a Label control, sets fonts and color accordingly, and displays the text returned by the following expression:
string name = HttpContext.Current.User.Identity.Name;
The LoginName control has a pretty slim programming interface that consists of only one property FormatString. FormatString defines the format of the text to display. It can contain only one placeholder, as shown here:
myLogin.FormatString = Welcome, {0}";
C10620245.fm Page 346 Thursday, June 10, 2004 12:29 PM
Part III
Application Services
If Dino is the name of the current user, the code generates a Welcome, Dino message.
The LoginStatus Control
The LoginStatus control indicates the state of the authentication for the current user. Its user interface consists of a link button to log in or log out, depending on the current user login state. If the user is acting as an anonymous user that is, he never logged in the control displays a link button to invite the user to log in. Otherwise, if the user successfully passed through the authentication layer, the control displays the logout button.
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