Introduction
这篇文章示范了如何使用asp.net中的表单验证。我写了一些类和一个使用这些类的小型web应用程序作示例。这个程序重点写了四个pages以实现这些功能：增加用户，给用户指派角色，给用户移除角色及管理角色。虽然我写的这些类提供了足够使用的功能，但为演示，我限制了User类的字段。这意味着，用户新注册账户时将提供基本的字段如：全名，Email，密码，个人简介等。如果以后需要，你可以很容易地增加其它字段。
The Classes Overview
这里有User, Role, SitePrincipal和 SiteIdentity 四个类，下面是这些类的属性和方法：
The User class
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Default parameter less constructor to create a new user
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This constructor gets a userID and looks up the user details from the database
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This constructor gets an email and looks up the user details from the database
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This method returns a DataSet of all the users available in the database
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This method returns a DataSet of roles assigned to the current user
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This static method grabs the userID and returns a roles ArrayList assigned to that user
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This method assigns a role to the current user
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This method removes current user from the role that has been passed by the roleID.
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Adds a new user to the database
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Updates current user information
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Deletes current user
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Gets/Sets user's id number
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Gets/Sets user's full name
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Gets/Sets user's email
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Gets/Sets user's password
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Gets/Sets user's biography
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Gets/Sets user's registering date
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The Role class
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Default parameter less constructor to create a new role
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This constructor gets a roleID and looks up the role details from the database
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This method returns a DataSet of all roles available in the database
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Adds a new role to the database
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Updates current role information
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Deletes current role
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Gets/Sets role ID number
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Gets/Sets role name
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The SitePrincipal class (implements the IIPrincipal Interface)
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This constructor gets a userID and looks up details from the database
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This constructor gets an email and looks up details from the database
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(IIPrincipal.IsInRole()) Indicates whether a current principal is in a specific role
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Adds a new user to the database
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