C# command not writing a line

Question

Well hello, how do I make this console write a line? I managed to make it so it run the cmd.exe when u process it, but it doesnt write the line.

private void button1_Click(object sender, EventArgs e)
    {
        if (textBox1.Text == "alpha")
        {
            progressBar1.Value = 100;
            if (progressBar1.Value == 100)
            {
                MessageBox.Show("Welcome back master!");
                System.Diagnostics.Process.Start(@"C:\Windows\System32\cmd.exe");
                Console.WriteLine("Hello!!!");
            }

        }

I think he wants to start a command line from a winform app and then write the line to the new console. — Alina B., Apr 18 '13 at 02:08
How do i make it work? I am new to c#. Also this is not the entire code, this is only the part of the code that's giving me troubles.@AlinaB Yes! — Tomislav Tomi Nikolic, Apr 18 '13 at 02:09
Possible duplicate of http://stackoverflow.com/questions/472282/show-console-in-windows-application — Andrew Savinykh, Apr 18 '13 at 02:18
If you want to create a console for your winform application, [this](http://stackoverflow.com/questions/3917202/how-do-i-include-a-console-in-winforms) could be helpful. — Chengxi Li, Apr 18 '13 at 02:19
And somewhat relevant discussion: http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/fd89cf64-eab4-4cc5-8f35-74ec848d8a60 — Andrew Savinykh, Apr 18 '13 at 02:21
And this http://stackoverflow.com/questions/807998/how-do-i-create-a-c-sharp-app-that-decides-itself-whether-to-show-as-a-console-o also seems relevant — Andrew Savinykh, Apr 18 '13 at 02:22
I am curious.. why would you want your WinForms app to write to a command console? Why not just append it to some multiline textbox for example? — Matt, Apr 18 '13 at 02:23

score 8 · Answer 1 · answered Apr 18 '13 at 02:23

if you want to interact with the console process, you need to do it like this :-

var p = new Process
    {
        StartInfo =
            {
                FileName = "cmd.exe", 
                UseShellExecute = false, 
                RedirectStandardInput = true, 
                RedirectStandardOutput = true
            }
    };
p.Start();
var w = p.StandardInput;                
w.WriteLine("Dir");
w.WriteLine("Exit");            
var theDirectoryListing = p.StandardOutput.ReadToEnd();
p.WaitForExit();
w.Close();            
p.Close();

score 4 · Answer 2 · answered Apr 18 '13 at 02:08

I'll assume this is a method that you somehow manage to call. The System.Diagnostics.Process.Start call will create a command box. However Console.WriteLine will try to write to whichever created your process (which is not the cmd.exe on the line above) and if it is a desktop app the call will have no console to write to, thus no message for you.

C# command not writing a line

2 Answers2