tmplinshi

$content = @'
using System.forms;
using System;

public class cla
{
	public string hello()
	{
		return "hello";
	}
}
'@

$append = @'
using System.IO;
using System.Text;
'@

$result = $content -replace '^(.|\r|\n)*\n\s*using\s+\w+.*?\n', ('$0' + $append + "`n")
$filePath = "$HOME\Desktop\a.txt"
Set-Content -Path $filePath -Value $result
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