Translate java method to C#.NET (verifysign)

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C#

Java

certificate

Hello

I have an application to sign with file .cer and .key, but when I try to validate the sign with only certificate file

This is the code in Java

public static String verifySign(String cerPath, String toVerify, String sign) {
String resultado = null;
Boolean blnResultado = false;
try (InputStream cer = new FileInputStream(new File(cerPath))) {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
Certificate cert = (X509Certificate) cf.generateCertificates(cer).iterator().next();

final Signature signature = Signature.getInstance("SHA256withRSA");
signature.initVerify(cert.getPublicKey());
signature.update(toVerify.getBytes("UTF-8"));

blnResultado = signature.verify(Base64.decodeBase64(sign.getBytes("UTF-8")));

} catch (Exception e) {
e.printStackTrace();

}
if(blnResultado.equals(Boolean.FALSE)) {
resultado = new String("Firma Incorrecta");
} else {
resultado = new String("Firma Correcta");
}
return resultado;
}

What I have tried:

I try to do the same thing in C# and I try to find other ways to verify signature generated by my application.