Function serviceStartStop{
    Do {
        $choice = Read-Host 'Do you want to do this locally (l) or remotely (r)?'
    } Until ($x -match '^(l|r)$')

    If ($choice -eq 'r') {
        Do {
            $computer = Read-Host 'Enter remote computer name.'
        } Until ($computer -ne '')
    }

    $serviceName = Read-Host "Please enter the service name."
    $title = "Start / Stop Service"
    $message = "Do you want to start or stop the service"
    $start = New-Object System.Management.Automation.Host.ChoiceDescription "&start","Starts the service"
    $stop = New-Object System.Management.Automation.Host.ChoiceDescription "&stop","Stops the service"
    $options = [System.Management.Automation.Host.ChoiceDescription[]]($start, $stop)
    $result = $host.ui.PromptForChoice($title, $message, $options, 0)

    Switch ($choice) {
        'r' # Remote Comptuer.
            {Switch ($result) {
                # Start.
                0 {
                    try {
                        Get-Service -ComputerName $computer -Name $serviceName | Start-Service -WhatIf
                    } catch {
                        Write-Warning -Message "Cannot find any service with the service name $serviceName."
                    }
                }
                # Stop
                1 {
                    try {
                        Get-Service -ComputerName $computer -Name $serviceName | Stop-Service -WhatIf
                    } catch {
                        Write-Warning -Message "Cannot find any service with the service name $serviceName."
                    }
                }
            }
        } # End Nested Switch #1.
        'l' # Local Computer.
            {Switch ($result) {
                # Start.
                0 {
                    try {
                        Get-Service -Name $serviceName -ErrorAction Stop | Start-Service -WhatIf
                    } catch {
                        Write-Warning -Message "Cannot find any service with the service name $serviceName."
                    }
                }
                # Stop.
                1 {
                    try {
                        Get-Service -Name $serviceName -ErrorAction Stop | Stop-Service -WhatIf
                    } catch {
                        Write-Warning -Message "Cannot find any service with the service name $serviceName."
                    }
                }
            }
        } # End Nested Switch #2.
    } # End External Switch.
}
serviceStartStop