OnDoc/Helper/clsFileHelper.cs

using NLog.LayoutRenderers;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Helper
{
    public class clsFileHelper
    {
        public string  save_temp_file(string data, string dokumentid, string temppath, string extension)
        {
            string filename = "";
            filename = temppath + DateTime.Now.ToString("yyyyMMddhhmmss") + "_" + dokumentid + "." + extension;

            //if (docfilename != "")
            //{
            //    filename = temppath + DateTime.Now.ToString("yyyyMMddhhmmss") + "_" + docfilename;
            //}            
             try
            {
                System.IO.File.WriteAllBytes(filename, Convert.FromBase64String(data));
                return filename;
            }
            catch
            {
                return "";
            }
        }

        public bool SaveBase64ToFile(string Base64String, string filename)
        {
            try
            {
                System.IO.File.WriteAllBytes(filename, Convert.FromBase64String(Base64String));
                return true;
            }
            catch
            {
                return false;
            }
            
        }
        public Stream GenerateStreamFromString(string s)
        {
            var stream = new MemoryStream();
            var writer = new StreamWriter(stream);
            writer.Write(s);
            writer.Flush();
            stream.Position = 0;
            return stream;
        }

        public String Base64FromFile(string filename)
        {
            Byte[] bytes = File.ReadAllBytes(filename);
            return Convert.ToBase64String(bytes);
        }
    }
}