.NET Process Start Process Error using credentials (The handle is invalid)

Question

I have an Windows Form application that supplies the User Name, Domain, and Password to the StartInfo, and it throws this:

System.ComponentModel.Win32Exception: The handle is invalid at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo) at System.Diagnostics.Process.Start()

When I allow the credentials to default to current user I get no such error, and the process I start works to the extent that it doesn't need to use credentials (the creds are necessary for mapping a drive in an MSBuild script). Here's the code that fills the start info:

Process p = new Process();
ProcessStartInfo si = new ProcessStartInfo(buildApp, buildArgs);
si.WorkingDirectory = msBuildWorkingDir;
si.UserName = txtUserName.Text;
char[] psw = txtPassword.Text.ToCharArray();
SecureString ss = new SecureString();
for (int x = 0; x < psw.Length; x++)
{
    ss.AppendChar(psw[x]);
}
si.Password = ss;
si.Domain = "ABC";
si.RedirectStandardOutput = true;
si.UseShellExecute = false;
si.WorkingDirectory = txtWorkingDir.Text;
p.StartInfo = si;
p.Start();

It isn't that the user/psw isn't matching, because when I provide a bad psw, for example, it catches it. So, this "invalid handle" thing is happening after the cred is passed. Any ideas on what I might be omitting or screwing up?

Answer 1

You have to redirect your Input, Error, and Output.

for example:

ProcessStartInfo info = new ProcessStartInfo("cmd.exe");
 info.UseShellExecute = false;
 info.RedirectStandardInput = true;
 info.RedirectStandardError = true;
 info.RedirectStandardOutput = true;
 info.UserName = dialog.User;

 using (Process install = Process.Start(info)) {
       string output = install.StandardOutput.ReadToEnd();
       install.WaitForExit();
       // Do something with you output data       
    Console.WriteLine(output);
 }

Also microsoft has said the error should read, "Unable to redirect input." (used to have a link, but that no longer worked)