.NET (Core and Framework)

private void Saveimg(Image image)
        { 
MemoryStream stream = new MemoryStream();
image.Save(stream,System.Drawing.Imaging.ImageFormat.Jpeg);//throw exeption

byte[]imgdata= new byte[stream.Length];
imgdata= stream.ToArray();
string Filename = "c:\\" + Convert.ToString(DateTime.Now.ToFileTime()) +".jpg";

FileStream fs = new FileStream(Filename, FileMode.CreateNew, FileAccess.Write);
fs.Write(imgdata, 0, imgdata.Length);            
fs.Close();

}