Simple text menu demo

$MenuItems = ('1 - First item',
              '2 - Second choice',
              '3 - Third selection',
              'x - Exit')
$ValidChoices = $MenuItems | ForEach-Object {$_[0]}

$Choice = ''
while ($Choice -notin $ValidChoices)
    {
    Clear-Host
    $MenuItems
    Write-Output ''
    $Choice = (Read-Host "Please enter a choice from the above items ").ToLower()
    }

Write-Output ''
switch ($Choice)
    {
    '1' {Write-Output "Do the first thing."; break}
    '2' {Write-Output "The 2nd thing must be done."; break}
    '3' {Write-Output "Three is the number of the thing to do."; break}
    'x' {Write-Output "Exit now."; break}
    }