[RESOLVED] cannot get error from commands in dos shell

[giodepa]

hi all,
I cannot understand why I cannot visualize error in richtextbox.text reported in dos shell.
this is my example code:

Dim start_info As New ProcessStartInfo("cmd.exe")
start_info.UseShellExecute = False
start_info.CreateNoWindow = True
start_info.RedirectStandardOutput = True
start_info.RedirectStandardError = True
 start_info.RedirectStandardInput = True
 
Dim proc As New Process()
proc.StartInfo = start_info
proc.Start()
 
proc.StandardInput.WriteLine("cd|")
proc.StandardInput.close
 
Dim std_out As StreamReader = proc.StandardOutput()
Dim std_err As StreamReader = proc.StandardError()
 
RichTextBox1.Text = std_out.ReadToEnd() + std_err.ReadToEnd()
 
 std_out.Close()
 std_err.Close()
 
proc.Close()

I should visualize in richtextbox1.text error message "the syntax of the command is incorrect" meanwhile I don't see anything.

can someone help me please?

thanks in advanced
gio