SmtpNetworkElement.UserName Property
.NET Framework 4
Gets or sets the user name to connect to an SMTP mail server.
Assembly: System (in System.dll)
Setting DefaultCredentials takes precedence over setting UserName and Password. UserName and Password are used only if DefaultCredentials is set to false.
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.