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SqlRoleProvider.RoleExists Method

Gets a value indicating whether the specified role name already exists in the role database.

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

No code example is currently available or this language may not be supported.

Parameters

roleName
Type: System.String

The name of the role to search for in the database.

Return Value

Type: System.Boolean
true if the role name already exists in the database; otherwise, false.

ExceptionCondition
System.ArgumentNullException

roleName is a null reference (Nothing in Visual Basic).

System.ArgumentException

roleName is an empty string or contains a comma.

-or-

roleName is longer than 256 characters.

System.Configuration.Provider.ProviderException

An unknown error occurred while communicating with the database.

The RoleExists method is called by the Roles class to determine whether a role name exists in the SQL Server database specified in the ASP.NET application's configuration file (Web.config).

The following code example uses the RoleExists method to determine whether a role name already exists before creating the role. For an example of a Web.config file that enables role management, see SqlRoleProvider.

Security noteSecurity Note:

This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

No code example is currently available or this language may not be supported.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0
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