Begins asynchronous SendCommand operation. Executes a command on the SMTP server.

Namespace:  Rebex.Legacy
Assembly:  Rebex.Smtp (in Rebex.Smtp.dll)


Visual Basic
Public Shared Function BeginSendCommand ( _
	instance As Smtp, _
	command As String, _
	callback As AsyncCallback, _
	state As Object _
) As IAsyncResult
public static IAsyncResult BeginSendCommand(
	Smtp instance,
	string command,
	AsyncCallback callback,
	Object state


Type: Rebex.Net..::..Smtp
Instance of Smtp.
Type: System..::..String
Command (e.g. "HELP").
Type: System..::..AsyncCallback
An optional asynchronous callback to be called when the operation is complete.
Type: System..::..Object
A user-provided object that identifies this particular asynchronous operation.

Return Value

An IAsyncResult that references the asynchronous operation.


Must be followed by a call to ReadResponse method.

Use ReadResponse and SendCommand to implement various custom commands.

In builds for .NET 4.0 and higher, this method is available as an extension method. Add 'using Rebex.Legacy' (C#) or 'Import Rebex.Legacy' (VB.NET) to your code in order to use it.

Version Information


Supported in: .NET 6.0, 5.0; .NET Framework 4.8, 4.7.x, 4.6.x, 4.5.x, 4.0

.NET Standard 2.0

Supported in: .NET Core 3.1; .NET Core 2.1; Xamarin.Android 10.1 (or higher); Xamarin.iOS 13.10 (or higher)

See Also