SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = "xxx",
    UserName = "xx",
    Password = "xxx",
    PortNumber = "xx",
    SshHostKeyPolicy = SshHostKeyPolicy.AcceptNew
};
 
using (session = new Session())
{                    
    session.Open(sessionOptions);
    
    TransferOptions transferOptions = new TransferOptions();
    transferOptions.TransferMode = TransferMode.Binary;
    transferOptions.ResumeSupport.State = TransferResumeSupportState.Off;
 
    var localTempPath = $"{Directory.GetCurrentDirectory()}\\{ sftpServer.SFTP.FileName}";
 
    // Download the file
    TransferOperationResult transferOperationResult = session.GetFiles($"{ sftpServer.SFTP.Directory}{ sftpServer.SFTP.FileName}", localTempPath, false, transferOptions);
    
 
    // Read the file
    result = File.ReadAllLines(localTempPath).Select(v => ImportSampleModel.FromCsv(v)).ToList();
 
    // Delete the file
    File.Delete(localTempPath);
}