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ActiveDirectoryMembershipProvider.RequiresUniqueEmail Property

Gets a value indicating whether an e-mail address stored on the Active Directory server must be unique.

Namespace:  System.Web.Security
Assembly:  System.Web (in System.Web.dll)

public override bool RequiresUniqueEmail { get; }

Property Value

Type: System.Boolean
true if e-mail addresses must be unique; otherwise, false. The default is false.


An attempt to access the RequiresUniqueEmail property was made before the ActiveDirectoryMembershipProvider instance was initialized.

When the RequiresUniqueEmail property is true, the ActiveDirectoryMembershipProvider instance ensures that the e-mail address is not used by any other user within the current scope when either the CreateUser or UpdateUser method is called.

The RequiresUniqueEmail property is set in your application's configuration file using the requiresUniqueEmail attribute of the membership Element (ASP.NET Settings Schema) element. If the property is not set in the application's configuration file, the RequiresUniqueEmail property is set to the default value of false.

The following code example shows a Web.config entry that configures an ActiveDirectoryMembershipProvider instance to require unique e-mail addresses for users stored on the Active Directory server.

    <add name="ADService" connectionString="LDAP://ldapServer/" />
    <membership defaultProvider="AspNetActiveDirectoryMembershipProvider">
        <add name="AspNetActiveDirectoryMembershipProvider" 
          System.Web, Version=2.0.3600, Culture=neutral, 
          requiresUniqueEmail="true" />

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.