how to Convert image to base64 in asp.net

Use below code to convert image to base 64.

 public string ConvertImageToBase64(string imgSrc)
        {
            try
            {
                var webClient = new WebClient();
                var imageBytes = webClient.DownloadData(imgSrc);
                return "data:image/png;base64," + Convert.ToBase64String(imageBytes);
            }
            catch
            {
                return string.Empty;
            }
        }