Process input/output

having a bit of trouble here.
I want to redirect input from my keyboard or rather from a textbox into the Process I am running.

I have been able to successfully, I think, redirect output from a console application using the Process/ProcessStartInfo, into a textbox but now I want to redirect my inputs with that process. How can I do this?

So far the only code I have is to redirect output from the application to the textbox, not even sure if its right:

Code:

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Process theProcess = new Process();
            theProcess.StartInfo = new ProcessStartInfo("cmd");

            theProcess.StartInfo.UseShellExecute = false;
            theProcess.StartInfo.RedirectStandardOutput = true;
            theProcess.StartInfo.RedirectStandardInput = true;
            theProcess.OutputDataReceived += new DataReceivedEventHandler(theProcess_OutputDataReceived);
            theProcess.Start();
            theProcess.BeginOutputReadLine();

void theProcess_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
      if (e.Data != null)
      {
          this.txtOutput.AppendText(e.Data);
         
      }
}

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