How to enroll SQL Server instances on multi server into an existing SQL Server Utility (PowerShell)?

Introduction

This PowerShell sample script is used to enroll SQL Server instances on multi server into an existing SQL Server Utility. This script applies to SQL Server 2008 R2 and SQL Server 2012 editions.

Scenarios

SQL Server Utility can manage the SQL Server environment as a whole through the concept of application and multiserver management in it, so after created one utility control point, administrator need to enroll instances of SQL Server into the SQL Server Utility. If your task included in below two scenarios, this script will be one good assistant.
1.There are multiple managed instances need to be enrolled tothe SQL Server Utility.
2.We can store the server and instance names in one .txt file.

Script

Assuming there are two rows in my E:\Onescript\Instances.txt file.

Server1\instance2
Server2\instance1

Customer can use this script by following below steps:
Step1: Launch the Windows PowerShell.Click Start, point to All Programs, point to Accessories, point to Windows PowerShell, right-click Windows PowerShell, and select Run As Administrator.
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Step2: Locate to the script path and load the script into current session.
Command: . E:\Onescript\enrollinstances.ps1
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Note: Replace the E:\Onescript\ with your path.

Step3: Call the function EnrollInstances.
Command: EnrollInstances
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Step4: The screen will prompt you enter in the utility instancename.
Command: Server1\instanceutility
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Step5: The screen will prompt you enter in a valid Windows domain account on the instance as the SQL Server Agent proxy account.
Command: Please Enter the Windows Domain Account:domain\accountname
Please Enter the password: ********
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Step6: The screen will prompt you enter in the full path of the .txt file, this file contains the instances that you would like to add to the utility instance.
Command: E:\Onescript\Instances.txt
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Here are some code snippets for your references. To get the complete script sample, please click the download button at the beginning of this page.

PowerShell

Edit|Remove

 #Check if the managed instances existed in this SQL Server Utility instance
 Foreach ($instance in $instances)
 {
   if ($instance.Name -eq $svr)
   {
   $ifExists =   $TRUE
   Write-host "The instance" $svr " had existed in the utility instance" $svrUtility
   }
 }

 #Check if the managed instances existed in this SQL Server Utility instance 
 Foreach ($instance in $instances) 
 { 
   if ($instance.Name -eq $svr) 
   { 
   $ifExists =   $TRUE 
   Write-host "The instance" $svr " had existed in the utility instance" $svrUtility 
   } 
 }

Additional Resources

Overview of SQL Server Utility
How to: Enroll an Instance of SQL Server (SQL Server Utility)
Using the SQL Server PowerShell Provider
Running Windows PowerShell Scripts