SqlMembershipProvider.RequiresUniqueEmail Property     
Definition
Important
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Gets a value indicating whether the SQL Server membership provider is configured to require a unique email address for each user name.
public:
 virtual property bool RequiresUniqueEmail { bool get(); };public override bool RequiresUniqueEmail { get; }member this.RequiresUniqueEmail : boolPublic Overrides ReadOnly Property RequiresUniqueEmail As BooleanProperty Value
true if the membership provider requires a unique email address; otherwise, false. The default is false.
Examples
The following code example shows the membership element in the system.web section of the Web.config file for an ASP.NET application. It specifies the SqlMembershipProvider instance and configures it to require a unique email address for each user name.
<membership defaultProvider="SqlProvider" userIsOnlineTimeWindow="20">
  <providers>
    <add name="SqlProvider"
      type="System.Web.Security.SqlMembershipProvider"
      connectionStringName="SqlServices"
      enablePasswordRetrieval="false"
      enablePasswordReset="true"
      requiresQuestionAndAnswer="true"
      passwordFormat="Hashed"
      requiresUniqueEmail="true"
      applicationName="MyApplication" />
  </providers>
</membership>