Implement a PowerShell pipeline with a script parameter in C#

I have a powershell script that I am trying to execute from C#. However, I get an error:
Get-Mailbox -ResultSize Unlimited | Select-Object DisplayName,Alias,Database,ServerName,PrimarySmtpAddress, @{Name=""EmailAddresses"";Expression={$_.EmailAddresses |Where-Object {$_.PrefixString -ceq ""smtp""} | ForEach-Object {$_.SmtpAddress}}}

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Just running Get-Mailbox -Resultsize Unlimited works, but I need greater control over the email addresses, hence the script parameter.

The error I get is:  Script block literals are not allowed in restricted language mode or a Data section.
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MlandaTAuthor Commented:
Michael, thanks for you input :) I am using the code below (I have only included the relevant snippet):
//After we have done this, we can now do the remote calls that will be executed on the server side as script blocks.
powershell = PowerShell.Create();
command = new PSCommand();
command.AddScript("Invoke-Command -ScriptBlock { Get-Mailbox -ResultSize Unlimited } -Session $ra");
//command.AddScript("Invoke-Command -ScriptBlock { Get-Mailbox -ResultSize Unlimited |Select-Object DisplayName,Alias,Database,ServerName,PrimarySmtpAddress, @{Name=\"EmailAddresses\";Expression={$_.EmailAddresses |Where-Object {$_.PrefixString -ceq \"smtp\"} | ForEach-Object {$_.SmtpAddress}}} } -Session $ra");
powershell.Commands = command;
powershell.Runspace = myRunSpace;

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What's interesting is that the call to command.AddScript("Invoke-Command -ScriptBlock { Get-Mailbox -ResultSize Unlimited } -Session $ra"); works and I get results. It's just when I try to execute the more complex PowerShell script which get more refined data back that I get the issues. the EmailAddress column returned by this working version includes multiple SMTP address alternatives and other detail which I do not need. The more complex PowerShell script strips out these other details. The complex PowerShell script works when I run it from PowerShell ISE. I only get issues when I run it from C#, but I am not sure how one constructs that pipeline from C#.
Michael FowlerSolutions ConsultantCommented:
Sorry for the delay.

You will need to use the pipeline class

I haven't done this myself but here is an example I found

dir | select -first 3

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  Runspace runspace = RunspaceFactory.CreateRunspace();
  Pipeline pipeline = runspace.CreatePipeline();
  Command dir = new Command("dir");
  Command select = new Command("select");
  select.Parameters.Add("first", 3);

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