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How do I set $ConfirmPreference = "None" for a PowerShell instance?

I am trying to run PowerShell scripts using C# using this link as a reference.
So far I have got:
try
{
using (PowerShell PowerShellInstance = PowerShell.Create())
{
PowerShellInstance.AddCommand(scriptPath);
var PSOutput = PowerShellInstance.Invoke();
if (PowerShellInstance.Streams.Error.Count > 0)
{
foreach (var line in PowerShellInstance.Streams.Error)
{
Console.WriteLine(line);
}
return false;
}
else
{
return true;
}
}
}
catch (Exception ex)
{
return false;
}
Which keeps throwing an exception:
"AuthorizationManager check failed."
Inner Exception: A command that prompts the user failed because the
host program or the command
type does not support user interaction. The host was attempting to
request confirmation with the following message: Run only scripts that
you trust. While scripts from the internet can be useful, this script
can potentially harm your computer. If you trust this script, use the
Unblock-File cmdlet to allow the script to run without this warning
message. Do you want to run C:\PowerShellScripts\MyScript.ps1?
So looking at the Exception I can see it's asking me to confirm the script but there is no window for the user to interact, hence the exception.
So I started looking at how to stop the confirmation text and found Powershell New-Item: How to Accept Confirmation Automatically
But even adding:
PowerShellInstance.AddScript("$ConfirmPreference = \"None\"");
PowerShellInstance.Invoke();
Before executing my script didn't work. So is there a way of setting $ConfirmPreference = "None" for my PowerShell instance using C#?

While the accepted answer solved this specific problem, the correct way of setting $ConfirmImpact preference variable is via session state:
var sessionState = InitialSessionState.CreateDefault();
sessionState.Variables.Add(new SessionStateVariableEntry("ConfirmPreference", ConfirmImpact.None, ""));
using (PowerShell shell = PowerShell.Create(sessionState))
{
// execute commands, etc
}
(This is for visitors who came here from Google search results)

I think it has something to do with the Execution Policy. You can query the execution policy with the Cmdlet Get-ExecutionPolicy. You can:
change the Execution Policy to (for example): "Unrestricted" by
using Set-ExecutionPolicy Unrestricted or
run your script by running powershell.exe -ExecutionPolicy Bypass C:\PowerShellScripts\MyScript.ps1 or
unblock the script by using the Cmdlet Unblock-File C:\PowerShellScripts\MyScript.ps1

Using Powershell in an ASP.NET application deployed to an IIS server

I'm developing a test project in ASP.NET MVC, where Im using System.Management.Automation to execute some PowerShell cmdlets.
Some of the cmdlets are from the Azure Powershell module.
The code is working fine when I run it from Visual Studio. But when I Published the website to IIS the some cmdlets and these scripts don't work.
Example, see the comments before:
var shell = PowerShell.Create();
var script1 = "Get-AzureSubscription | Out-String"; // cant execute the cmdlet
var script2 = "C:\\inetpub\\wwwroot\\App1\\Scripts\\test.ps1"; //Cant execute the script.
var script3 = "Get-Date"; //Work fine
try
{
shell.Commands.AddScript(script); // here insert the script.
Collection<PSObject> results = shell.Invoke();
//Search for errors, if some error is found redirect to an Error page.
if (shell.Streams.Error.Count > 0)
{
foreach (ErrorRecord err in shell.Streams.Error)
{
string error = err.ToString();
TempData["pserror"] = error;
return RedirectToAction("Powershellerror");
}
}
else
if (results.Count > 0)
{
foreach (var psObject in results)
{
string result2 = psObject.ToString();
TempData["psoutput"] = result2;
return RedirectToAction("PowershellOutput");
}
}
Both, script1 and script2 give this error:
The term 'C:\inetpub\wwwroot\App1\Scripts\test.ps1' is not recognized
as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that
the path is correct and try again.
and
The term 'Get-AzureSubscription' is not recognized as the name of a
cmdlet, function, script file, or operable program. Check the spelling
of the name, or if a path was included, verify that the path is
correct and try again.
What could be??? Something is missing in the IIS setup?

You probably need to import the Azure module, try as suggested here:
https://stackoverflow.com/a/6267517/1183475
var ps = PowerShell.Create(myRS);
ps.Commands.AddCommand("Import-Module").AddArgument(#"g:\...\PowerDbg.psm1")
ps.Invoke()
I don't have the Azure PS tools installed on this machine, but the path should be:
"C:\Program Files (x86)\Microsoft SDKs\Windows Azure\PowerShell\Azure\Azure.psd1

The term 'New-CsOnlineSession' is not recognized as the name of a cmdlet

I am trying to run a power shell script from the c#.
When running the power shell script only, it runs successfully. But , while trying to run the same script from the c# . I get the error "The term 'New-CsOnlineSession' is not recognized as the name of a cmdlet"
Here is the code:
public static void GetLyncUsers(string userName, string password)
{
using (PowerShell powerShellInstance = PowerShell.Create())
{
var script = string.Format("$Username =\"{0}\"\n" +
"$Password =\"{1}\"\n" +
"$secpasswd = ConvertTo-SecureString $Password -AsPlainText -Force\n" +
"$cred = new-Object System.Management.Automation.PSCredential ($Username , $secpasswd)\n" +
"$CSSession = New-CsOnlineSession -Credential $cred\n" +
"Import-PSSession $CSSession -AllowClobber\n" +
"Get-CsOnlineUser", userName, password);
// use "AddScript" to add the contents of a script file to the end of the execution pipeline.
// use "AddCommand" to add individual commands/cmdlets to the end of the execution pipeline.
powerShellInstance.AddScript(script);
// use "AddParameter" to add a single parameter to the last command/script on the pipeline.
// invoke execution on the pipeline (collecting output)
Collection<PSObject> psOutput = powerShellInstance.Invoke();
// check the other output streams (for example, the error stream)
if (powerShellInstance.Streams.Error.Count > 0)
{
// I am getting this error
//The term 'New-CsOnlineSession' is not recognized as the name of a cmdlet
}
}
Is there anything i am missing? I am new to powershell in general.

Solution:
using (PowerShell powerShellInstance = PowerShell.Create())
{
// Import-Module lynconlineconnector
powershellInstance.Commands
.AddCommand("Import-Module")
.AddArgument("lynconlineconnector");
// rest of your code ....
Why?
When running an interactive session in powershell v3 and higher, the host traps CommandNotFound, and searches every module in all the known locations. If it finds the command, it automatically loads the module, and proceeds normally.
When running same script in C#, the CommandNotFound exception isn't trapped, and hence you get the error.
Related Question(s):
PowerShell - How to Import-Module in a Runspace
#PSTip Cmdlet Discovery and Module auto-loading

I ran into the same problem. You have to install the Lync/Skype For Business Online Connector as described on Technet
The setup program copies the Skype for Business Online Connector
module (and the New-CsOnlineSession cmdlet) to your local computer.

Executing cmdlet Get-ClusterGroup from C#

Hi I'm trying to execute the Get-ClusterGroup cmdlet from C# 4.0. I've used the following code
InitialSessionState iss = InitialSessionState.CreateDefault();
iss.ImportPSModule(new string[] { "failoverclusters"});
Runspace myRunSpace = RunspaceFactory.CreateRunspace(iss);
myRunSpace.Open();
Pipeline pipeLine = myRunSpace.CreatePipeline();
Command myCommand = new Command("Get-ClusterGroup");
pipeLine.Commands.Add(myCommand);
Console.WriteLine("Invoking Command");
Collection commandResult = pipeLine.Invoke();
foreach (PSObject resultObject in commandResult)
{
Console.WriteLine(resultObject.ToString());
}
myRunSpace.Close();
But getting the following error
The term 'Get-ClusterGroup' is not recognized as the name of a cmdlet, function,
script file, or operable program. Check the spelling of the name, or if a path
was included, verify that the path is correct and try again.
It will be great if someone can show me the where I'm missing the logic or where is the problem in my code

Get-ClusterGroup is a Powershell Commandlet, not an .exe file. You can invoke Powershell commands from .NET using the System.Management.Automation.PowerShell class, as described on MSDN here: http://msdn.microsoft.com/en-us/library/system.management.automation.powershell(v=vs.85).aspx

Powershell Pipe and Foreach-Object in c#

I am invoking a get-msoluser cmdlet of office365 and i use the following cmdlet in powershell
Get-MsolUser -UserPrincipalName user#organization.onmicrosoft.com | ForEach-Object{ $_.licenses}
The output is a collection of licenses and i wanted the same script to be run in c#. so i have written the code as follows
private void displayLicenses(){
Command cmd = new Command("Get-MsolUser");
cmd.Parameters.Add("UserPrincipalName","user#organization.onmicrosoft.com");
Command cmd2 = new Command("ForEach-Object");
cmd2.Parameters.Add("$_.licenses.AccountSku");
Pipeline pipe = Office365Runspace.CreatePipeline();
pipe.Commands.Add(cmd);
pipe.Commands.Add(cmd2);
Console.WriteLine("Before invoking the pipe");
ICollection<PSObject> result = pipe.Invoke();
CheckForErrors(pipe);
Console.WriteLine("Executed command {0} + {1} with no error", cmd.CommandText, cmd2.CommandText);
foreach(PSObject obj in result){
foreach(PSPropertyInfo propInfo in obj.Properties){
Console.WriteLine(propInfo.Name+": "+propInfo.Value+" "+propInfo.MemberType);
}
}
}
But i still get an error on executing this function saying
Unhandled Exception:
System.Management.Automation.CommandNotFoundException: The term
'ForEach-Object' is not recognized as the name of a cmdlet, function,
scrip t file, or operable program. Check the spelling of the name, or
if a path was in cluded, verify that the path is correct and try
again.
I checked that my project has a reference to System.management.Automation.dll file that contains the ForEach-Object cmdlet.
I found the dll using this cmd in powershell
(Get-Command ForEach-Object).dll
Thanks,
Satya

I figured out the problem causing for the issue. It is due to the misconfigured runspace i created.
InitialSessionState initalState = InitialSessionState.Create();
initalState.ImportPSModule(new String[] { "msonline" });
//initalState.LanguageMode = PSLanguageMode.FullLanguage;
Office365Runspace = RunspaceFactory.CreateRunspace(initalState);
Office365Runspace.Open();
i was creating the initalstate with empty one,When i changed it to default one it worked fine.On creating the default one it includes all the modules that were obtained by default.
InitialSessionState initalState = InitialSessionState.CreateDefault();
it worked fine.
Thanks,
Satya

It sounds like your're trying to run that in the remote session at the Exchange server. Those are NoLanguage constrained sessions, meaning that you can only run the Exchange cmdlets in those sessions. If you want to use PowerShell core language cmdlets (like foreach-object), you have to do that in a local session and either use Import-PSSession to import the Exchange functions into your local session (implicit remoting) , or use Invoke-Command and point it at the remote session on the Exchange server.