Multipart Form Data Request

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;


class MultipartFormDataRequest
{
    private List<MultipartRequestParams> reqContents = new List<MultipartRequestParams>();

    public enum MultipartRequestParamsTypes
    {
        MultipartFormData,
        MultipartFileData
    };

    class MultipartRequestParams
    {

        public MultipartRequestParamsTypes formType
        {
            get;
            set;
        }
        public string formName
        {
            get;
            set;
        }
        public string formValue
        {
            get;
            set;
        }
        public string formFile
        {
            get;
            set;
        }

        public MultipartRequestParams(string name, string value, MultipartRequestParamsTypes formType = MultipartRequestParamsTypes.MultipartFormData)
        {
            this.formType = formType;
            this.formName = name;
            if (formType == MultipartRequestParamsTypes.MultipartFormData)
                this.formValue = value;
            else
                this.formFile = value;
        }

    };
    public void Clear()
    {
        reqContents.Clear();
    }

    public void AddParam(string name, string value, MultipartRequestParamsTypes formType = MultipartRequestParamsTypes.MultipartFormData)
    {
        reqContents.Add(new MultipartRequestParams(name, value, formType));
    }

    public string Send(string url)
    {
        var wreq = HttpWebRequest.Create(url) as HttpWebRequest;
        wreq.Method = WebRequestMethods.Http.Post;
        string boundary = "----WebKitFormBoundary" + Guid.NewGuid();
        wreq.ContentType = "multipart/form-data; boundary=" + boundary;
        using (var reqStream = wreq.GetRequestStream())
        {
            byte[] bNewBoundaryLine = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
            foreach (var item in reqContents)
            {
                if (item.formType == MultipartRequestParamsTypes.MultipartFormData)
                {
                    reqStream.Write(bNewBoundaryLine, 0, bNewBoundaryLine.Length);
                    byte[] bFormName = Encoding.UTF8.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n", item.formName));
                    reqStream.Write(bFormName, 0, bFormName.Length);
                    byte[] bFormValue = Encoding.UTF8.GetBytes(string.Format("{0}", item.formValue));
                    reqStream.Write(bFormValue, 0, bFormValue.Length);
                }
                else
                {
                    reqStream.Write(bNewBoundaryLine, 0, bNewBoundaryLine.Length);
                    byte[] bFormName = Encoding.UTF8.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-type: application/exe\r\n\r\n", item.formName, item.formFile));
                    reqStream.Write(bFormName, 0, bFormName.Length);
                    byte[] bFormValue = File.ReadAllBytes(item.formFile);
                    reqStream.Write(bFormValue, 0, bFormValue.Length);
                }
            }

            byte[] bClosingboundaryLine = Encoding.UTF8.GetBytes("--" + boundary + "--");
            reqStream.Write(bClosingboundaryLine, 0, bClosingboundaryLine.Length);

            using (var resReader = new StreamReader(wreq.GetResponse().GetResponseStream()))
                return resReader.ReadToEnd();
        }
    }
}