'Declaration
 
Public Overloads Function BeginAuthenticate( _
   ByVal authenticationMethod As AuthenticationMethod, _
   ByVal verificationFlags As VerificationFlags, _
   ByVal clientCertificate As Certificate, _
   ByVal dataProtection As DataChannelProtection, _
   ByVal callback As AsyncCallback, _
   ByVal state As Object _
) As IAsyncResult

'Usage
 
Dim instance As AsyncFtpClient
Dim authenticationMethod As AuthenticationMethod
Dim verificationFlags As VerificationFlags
Dim clientCertificate As Certificate
Dim dataProtection As DataChannelProtection
Dim callback As AsyncCallback
Dim state As Object
Dim value As IAsyncResult
 
value = instance.BeginAuthenticate(authenticationMethod, verificationFlags, clientCertificate, dataProtection, callback, state)

public IAsyncResult BeginAuthenticate( 
   AuthenticationMethod authenticationMethod,
   VerificationFlags verificationFlags,
   Certificate clientCertificate,
   DataChannelProtection dataProtection,
   AsyncCallback callback,
   object state
)

Parameters

authenticationMethod

The authentication method used to connect to the FTP server.

verificationFlags

The verification flags used to verify the FTP server's certificate.

clientCertificate

The FTP client's certificate.

dataProtection

How the data channels will be protected.

callback

Callback method to be called when the asynchronous operation is completed.

state

An object containing state information for this operation.

Return Value

The BeginConnect method that requires an authentication method, verification flags and a client certificate can be used in the case where the FTP server does not allow authentication after the connection has been established.

When using a callback, the System.IAsyncResult is provided as a parameter. You should call EndAuthenticate in that callback. When NOT providing a callback, you should keep the returned IAsyncResult and call EndAuthenticate with it when ready to complete. In this later case, the call to EndAuthenticate may block until the operation completes.

.NET: net5.0, net5.0-windows, net6.0, net6.0-macos, net6.0-windows, net7.0, net7.0-macos, net7.0-windows, net8.0, net8.0-browser, net8.0-macos, net8.0-windows, net9.0, net9.0-browser, net9.0-macos, net9.0-windows, net10.0, net10.0-browser, net10.0-macos, net10.0-windows.

.NET Standard: netstandard2.0, netstandard2.1

.NET Framework: net20, net35, net40, net403, net45, net451, net452, net46, net461, net462, net463, net47, net471, net472, net48, net481.

Reference

AsyncFtpClient Class
AsyncFtpClient Members
Overload List
EndAuthenticate Method
System.IAsyncResult
EndAuthenticate Method
System.IAsyncResult