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copied!<p>This is working for me:</p> <pre><code>private void button1_Click(object sender, EventArgs e) { using (Process sortProcess = new Process()) { sortProcess.StartInfo.FileName = @"F:\echo_hello.bat"; sortProcess.StartInfo.CreateNoWindow = true; sortProcess.StartInfo.UseShellExecute = false; sortProcess.StartInfo.RedirectStandardOutput = true; // Set event handler sortProcess.OutputDataReceived += new DataReceivedEventHandler(SortOutputHandler); // Start the process. sortProcess.Start(); // Start the asynchronous read sortProcess.BeginOutputReadLine(); sortProcess.WaitForExit(); } } void SortOutputHandler(object sender, DataReceivedEventArgs e) { Trace.WriteLine(e.Data); this.BeginInvoke(new MethodInvoker(() => { richTextBox1.AppendText(e.Data ?? string.Empty); })); } </code></pre> <p><a href="http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=EN-US&k=k%28SYSTEM.DIAGNOSTICS.PROCESS.BEGINOUTPUTREADLINE%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK,VERSION=V4.0%22%29;k%28DevLang-CSHARP%29&rd=true" rel="nofollow">The example you started with</a> was a console application, which doesn't care much about multithreaded access. For Windows Forms when you update a control this has to be done from the main UI thread, which is why <code>BeginInvoke</code> is needed. If you want to check rapidly if a handler like <code>SortOutputHandler</code> is working properly you can use <code>System.Diagnostics.Trace.Write*</code>, which doesn't need <code>BeginInvoke</code>.</p> <p><strong>EDIT:</strong> <code>echo_hello.bat</code> simply echoes the "hello" string:</p> <pre><code>@echo off echo hello </code></pre>

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