c# - Captured output is empty -

i'm trying capture output other applications. capturing output ping works well. variable output contains expected output.

    var p = new process();     p.startinfo.filename = "ping";     p.startinfo.arguments = "www.google.com";     p.startinfo.useshellexecute = false;     p.startinfo.redirectstandardoutput = true;     p.startinfo.createnowindow = true;     p.start();      var output = p.standardoutput.readtoend();     p.waitforexit(); 

but when use code capturing output of expdp (which oracle tool exports), variable empty. runnig same command in console return output.

    p.startinfo.filename = "expdp";     p.startinfo.arguments = "help=y"; 

am missing ?

try checking standarderror stream , see if there

var p = new process(); p.startinfo.filename = "expdp"; p.startinfo.arguments = "help=y"; p.startinfo.useshellexecute = false; p.startinfo.redirectstandardoutput = true; p.startinfo.redirectstandarderror = true; p.startinfo.createnowindow = true; p.start();  var error = p.standarderror.readtoend(); var output = p.standardoutput.readtoend(); p.waitforexit(); 

one thing note, if either output stream or error stram long, approach can cause deadlocks.

if case, you'll have read 1 of streams asynchronously.