How to redirect Std input ?

Hi,
I am a newbie to C# and Im trying to redirect standard input, output and error of a console program written in C (MS VC 6.0) to a textbox on a form. The code for the redirecting looks like this:

private System.IO.StreamWriter c_StreamInput = null;
private System.IO.StreamReader c_StreamOutput = null;
private Thread c_ThreadRead = null;
private Process c_Process = null;

private void ReadStdOutputThreadProc()
{
try
{
string str = c_StreamOutput.ReadLine();
while(str != null)
{
txtboxCNF.AppendText(str+"\r\n");
Thread.Sleep(100);
str = c_StreamOutput.ReadLine();
}
}
catch(Exception) {}
}

private void btnStart_Click(object sender, System.EventArgs e)
{
if(c_Process == null)
{
c_Process = new Process();
ProcessStartInfo psi = new ProcessStartInfo("console.exe");
psi.UseShellExecute = false;
psi.RedirectStandardInput = true;
psi.RedirectStandardOutput = true;
psi.CreateNoWindow = true;
c_Process.StartInfo = psi;
c_Process.Start();

c_StreamInput = c_Process.StandardInput;
c_StreamOutput = c_Process.StandardOutput;

c_StreamInput.AutoFlush = true;

c_ThreadRead = new Thread(new ThreadStart(ReadStdOutputThreadProc));
c_ThreadRead.Start();
}
}

private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (c_ThreadRead != null)
{
c_ThreadRead.Abort();
c_ThreadRead.Join();
}
if(c_Process != null && !c_Process.HasExited)
c_Process.Kill();
}

The console application that I am trying to run (console.exe) is a simple C program that prints a line text and then calls the getchar() function. The code is basically this:

#include "stdafx.h"
#include

int main(int argc, char* argv[])
{
printf ("Hello World !!\n");
int ch = getchar();
printf("Character = %s\n", ch);
return 0;
}

I have tried to run the C program without the getchar() function and it works. The problem arises when I use the getchar() function. I have tried getch() and gets() version without any success. I am not sure if I have to do anything special for showing output when using such functions.

Any help/pointers in this direction will be greately appreciated.

Thanks in advance.