Command Prompt one by one

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VB

Is there a way to enter DOS commands in VB 2010 one after the other on the same cmd window (without using Batch files)? Whenever I try to enter a new command, it opens another cmd window. Here is what I currently have:

Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim p As New Process
Dim psi As New ProcessStartInfo("cmd.exe", & txtCommand.text)

p.StartInfo = psi
p.Start()
p.WaitForExit()

End Sub