Powershell Find/Replace: Recursively replace text in all *.config files in a directory using .NET

recursive_find_replace.ps1

$configFiles = Get-ChildItem C:\YourDirectory *.config -Recurse
foreach ($file in $configFiles)
{
    $content = [System.IO.File]::ReadAllText($file.FullName).Replace('foo','bar')
    [System.IO.File]::WriteAllText($file.FullName, $content)
}