Convert Images into .png format

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using System.Drawing;

Bitmap b = (Bitmap)Bitmap.FromStream(file.InputStream);

using (MemoryStream ms = new MemoryStream()) {
    b.Save(ms, ImageFormat.Png);

    // use the memory stream to base64 encode..
}

FileStream FS = new FileStream(filepath, FileMode.Open, FileAccess.Read); //create a file stream object associate to user selected file 
byte[] img = new byte[FS.Length]; //create a byte array with size of user select file stream length
FS.Read(img, 0, Convert.ToInt32(FS.Length));//read user selected file stream in to byte array