C# How to save an images to SD card?

I'm using Xamarin for Android. I load an image and put it in ImageView, then I edit the image. Next I want to save that image to SD card.

Anyone know how to save the image into SD card because I only can find it in Java Android. I already try to convert the code from Java to C# but still get an error.

Any help, thanks in advance.

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I get an error at InputStream iS = Resources.OpenRawResource(Resource.Drawable.Icon); as the error is "cannot implicitly convert type 'System.IO.Stream' to 'Java.IO.InputStream'"

Here's the code:

Java.IO.File path = Android.OS.Environment.GetExternalStoragePublicDirectory (Android.OS.Environment.DirectoryPictures);
Java.IO.File file = new Java.IO.File (path, "Icon.png");

try {
    path.Mkdirs();
    InputStream iS = Resources.OpenRawResource(Resource.Drawable.Icon);
    OutputStream oS = new FileOutputStream(file);
    byte[] data = new byte[iS.Available()];
    iS.Read(data);
    oS.Write(data);
    iS.Close();
    oS.Close();
} catch (Exception ex) {
    // ...
}