Add multiple security groups to computers using PowerShell

Help with script that can add multiple member groups to computers.

My script works if I only get one member group and assign it to a variable but when I assign multiple groups to a variable it doesn't like it. Someone please feel free to school me here.

# Computer Path to my computers in ADUC
$CP = "OU=folder,DC=domain,DC=com"

# Group Path to my member groups
$GP = "OU=Groups,DC=domain,DC=com"

# Groups that I want to add to computers
$SecGroup = Get-ADGroup -Filter {Name -like 'MemGroup1' -or Name -like 'MemGroup2' -or Name -like 'MemGroup3'} -SearchBase $GP

$C = Get-ADComputer -Filter 'Name -like "ComputerName"' -Properties * -SearchBase $CP

PS > Add-ADGroupMember $SecGroup -Members $C

Add-ADGroupMember : Cannot convert 'System.Object[]' to the type 'Microsoft.ActiveDirectory.Management.ADGroup' required by parameter 'Identity'. Specified method is not supported.

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This works however if I change my $SecGroup variable to only grab one member group. But if I add more than one group then it breaks?

Thanks
ryanmavesAsked:
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SubsunCommented:
In the following Syntax.. You can see the the Identity parameter doesn't accept an array of values like Members parameter..
Add-ADGroupMember -Identity <ADGroup> -Members <ADPrincipal[]>

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You can use Foreach to loop the groups to assign membership..
$SecGroup | %{Add-ADGroupMember $_.Name -Members $C}

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ryanmavesAuthor Commented:
Perfect!

I was trying to use the ForEach-Object cmdlet but looks like I was using it incorrectly. Thanks for the tip it even works if I assign multiple computers to $C, excellent!
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