functions/Invoke-RefreshDatabase.ps1

function Invoke-RefreshDatabase {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory, ParameterSetName='AdHoc')]
        [string]$Source,

        [Parameter(Mandatory, ParameterSetName='AdHoc')]
        [string]$Destination
    )
    Write-Host 'code will be here'
}