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（1）错误页面路径：

l         ms-help://MS.MSDNQTR.v80.en/MS.MSDN.v80/MS.NETDEVFX.v20.en/cpref16/html/P_System_Web_UI_WebControls_Login_UserNameRequiredErrorMessage.htm

（2）页面内容：

Note: This property is new in the .NET Framework version 2.0.

Gets or sets the error message to display in a ValidationSummary control when the user name field is left blank.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

Syntax

Visual Basic (Declaration)

<LocalizableAttribute(True)> _

Public Overridable Property UserNameRequiredErrorMessage As String

Visual Basic (Usage)

Dim instance As Login

Dim value As String

value = instance.UserNameRequiredErrorMessage

instance.UserNameRequiredErrorMessage = value

C#

[LocalizableAttribute(true)]

public virtual string UserNameRequiredErrorMessage { get; set; }

C++

[LocalizableAttribute(true)]

public:

virtual property String^ UserNameRequiredErrorMessage {

         String^ get ();

         void set (String^ value);

}

J#

/** @property */

public String get_UserNameRequiredErrorMessage ()

/** @property */

public void set_UserNameRequiredErrorMessage (String value)

JScript

public function get UserNameRequiredErrorMessage () : String

public function set UserNameRequiredErrorMessage (value : String)

Property Value

The error message to display in a ValidationSummary control when the user name field is left blank. The default is "User Name." （错误在此）

（3）简要说明：

在属性说明中，默认值是不正确的。根据VS 2005中的设置，默认值为：User Name is required.