We want to use brill tagger such that on a button click, it will tag the Input.txt into output.txt. So we have created a new visual studio project and put a button. On button click event we wrote the following code. There are no errors and we can see the command prompt getting invoked. But the output file is not getting created. The code is as follows. could you pls guide us?? private void button1_Click(object sender, EventArgs e) { ProcessStartInfo brillStartInfo = new ProcessStartInfo(@"C:\Users\toshal\Documents\Visual Studio 2008\Projects\brill tagger\bin\brill.exe"); brillStartInfo.Arguments = "/C brill.exe LEXICON.BROWN Input.txt BIGRAMS LEXICALRULEFILE.BROWN CONTEXTUALRULEFILE.BROWN > output.txt"; brillStartInfo.UseShellExecute = false; brillStartInfo.RedirectStandardOutput = true; brillStartInfo.RedirectStandardError = true; brillStartInfo.CreateNoWindow = false; Process brill = new Process(); brill.StartInfo = brillStartInfo; brill.Start(); string output = brill.StandardOutput.ReadToEnd(); brill.WaitForExit(); }