Convert pem rsa key to xml for C# RSACryptoServiceProvider.FromXmlString

I generating rsa public and private key with php

<?
function genKeys($pkey, $skey){
    $pkGenerate = openssl_pkey_new(array(
        'private_key_bits' => 2048,
        'private_key_type' => OPENSSL_KEYTYPE_RSA
    ));

    $pkGeneratePrivate = null;
    openssl_pkey_export($pkGenerate,$pkGeneratePrivate);

    $pkGenerateDetails = openssl_pkey_get_details($pkGenerate);
    $pkGeneratePublic = $pkGenerateDetails['key'];

    openssl_pkey_free($pkGenerate);

    $pkImport = openssl_pkey_get_private($pkGeneratePrivate);
    $pkImportDetails = openssl_pkey_get_details($pkImport);
    $pkImportPublic = $pkImportDetails['key'];
    openssl_pkey_free($pkImport);

    if (strcmp($pkGeneratePublic,$pkImportPublic)){
        file_put_contents($pkey, $pkGeneratePrivate);
        file_put_contents($skey, $pkGeneratePublic);
        return true;
    }else return false;
}
?>

And i need use pem file with RSACryptoServiceProvider.

So, how to convert pem public and private to xml?