Powershell AD computer add to group help

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  I have created a script its running fine i just want to add a logic in the script if the computer object is not exists in AD it will give a pop up "Computer not exists in AD"

  Any help is appreciated. 

     $ListApps = "Office"
     $Global:computers = gc C:\Serverlist.txt
     if (!$ListApps) {
          [System.Windows.Forms.MessageBox]::Show("Please select an AD group","Sorry!",[windows.forms.messageboxbuttons]::Ok, [windows.forms.messageboxicon]::Warning) 
          }
  
      else {
  
          $AppGroup = $ListApps
  
          $Group = Get-ADGroup -Identity $AppGroup 
  
              foreach ($Hostname in $Computers){
  
                  $member = Get-ADComputer -Identity "$Hostname" -Properties MemberOf | Select-Object MemberOf
                  $pc = Get-ADComputer "$Hostname" | Select -expand SamAccountName
  
                  if ($member.Memberof -like "$Group"){
                      [System.Windows.Forms.MessageBox]::Show("$Hostname is already a member of $AppGroup","Whoops!",[windows.forms.messageboxbuttons]::Ok, [windows.forms.messageboxicon]::Question)
                  }
  
                  else {
                      Add-ADGroupMember $AppGroup $pc -passthru
                      [System.Windows.Forms.MessageBox]::Show("$Hostname has been added to $AppGroup", "Success!",[windows.forms.messageboxbuttons]::Ok, [windows.forms.messageboxicon]::Information)  
                  }
                  
  
              }  
      }
  
  

  
  

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  Lalit

  Tuesday, December 12, 2017 8:38 AM