Plink is a command-line version of PuTTY, a Windows SSH client program. I am trying to get the output from plink to display in a textbox within a VB form. I can get it to work but I must hit the ENTER key twice before it shows anything, everytime. So I end up with repeated commands thrown at plink. Anyone know why I'm seeing this?

Imports System.Text
Imports System.IO

Public Class Form1
    ' Define static variables shared by class methods.
    Private Shared shellOutput As StringBuilder = Nothing
    Private Shared numOutputLines As Integer = 0
    Private Shared stdIN As StreamWriter
    Private Shared p As New Process

    Private Shared Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
        Form1.txtReceive.Text = shellOutput.ToString
    End Sub

    Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
        Dim p_info As New ProcessStartInfo
        p_info.FileName = "C:\plink.exe"
        p_info.Arguments = " -l username -pw password host"
        p_info.UseShellExecute = False
        p_info.CreateNoWindow = True
        p_info.RedirectStandardOutput = True
        p_info.RedirectStandardInput = True

        ' Set our event handler to asynchronously read the shell output.
        AddHandler p.OutputDataReceived, AddressOf dirOutputHandler
        shellOutput = New StringBuilder
        p.StartInfo = p_info
        stdIN = p.StandardInput
        txtReceive.Text = shellOutput.ToString
    End Sub

    Private Shared Sub dirOutputHandler(ByVal sendingProcess As Object, ByVal outLine As DataReceivedEventArgs)
        ' Collect the sort command output.
        If Not String.IsNullOrEmpty(outLine.Data) Then
            numOutputLines += 1

            ' Add the text to the collected output.
            shellOutput.Append(Environment.NewLine + outLine.Data)
        End If
    End Sub
End Class

I was stepping through the code in a debugger and found that when I do it that way, I dont have to hit ENTER twice. For some reason, it works properly in the debugger. I think this may be a timing issue.