Gets a value indicating whether the membership provider is configured to require a unique email address for each user name.
获取一个值，指示成员资格提供程序是否配置为要求每个用户名具有唯一的电子邮件地址。
Gets a value indicating whether the membership provider is configured to require a unique email address for each user name.
获取一个值，指示成员资格提供程序是否配置为要求每个用户名具有唯一的电子邮件地址。
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