public Bitmap GetImageFromBase64(string base64string)

        {

            byte[] b = Convert.FromBase64String(base64string);

            MemoryStream ms = new MemoryStream(b);

            Bitmap bitmap = new Bitmap(ms);

            return bitmap;

        }

public string GetBase64FromImage(string imagefile)

{

    string strbaser64 = "";

    try

    {

        Bitmap bmp = new Bitmap(imagefile);

        MemoryStream ms = new MemoryStream();

        bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

        byte[] arr = new byte[ms.Length];

        ms.Position = ;

        ms.Read(arr, , (int)ms.Length);

        ms.Close();

        strbaser64 = Convert.ToBase64String(arr);

    }

    catch (Exception)

    {

        throw new Exception("Something wrong during convert!");

    }

    return strbaser64;

}