WebClient implement multi-file/text upload simultaneously

 Public classcreatebytes {Encoding Encoding=Encoding.UTF8; /**/        /// <summary>        ///stitching all binary arrays into an array/// </summary>        /// <param name= "Bytearrays" >Array</param>        /// <returns></returns>        /// <remarks>Plus end Border .</remarks>         Public byte[] joinbytes (ArrayList bytearrays) {intLength =0; intReadlength =0; //Plus end Border .            stringEndboundary = boundary +"--\r\n";//End Border            byte[] Endboundarybytes =encoding.            GetBytes (endboundary);            Bytearrays.add (endboundarybytes); foreach(byte[] Binchbytearrays) {Length+=b.length; }            byte[] bytes =New byte[length]; //Traversal Replication//            foreach(byte[] Binchbytearrays)                {b.copyto (bytes, readlength); Readlength+=b.length; }            returnbytes; }         Public BOOLUploaddata (stringUploadurl,byte[] Bytes, out byte[] responsebytes) {WebClient WebClient=NewWebClient (); WEBCLIENT.HEADERS.ADD ("Content-type", ContentType); Try{responsebytes=webclient.uploaddata (uploadurl, bytes); return true; }            Catch(WebException ex) {Stream resp=Ex.                Response.getresponsestream (); ResponseBytes=New byte[Ex.                Response.contentlength]; Resp. Read (ResponseBytes,0, responsebytes.length); }            return false; }        /**/        /// <summary>        ///get a normal form area binary array/// </summary>        /// <param name= "FieldName" >Table sole name</param>        /// <param name= "Fieldvalue" >form Values</param>        /// <returns></returns>        /// <remarks>        ///-----------------------------7d52ee27210a3c\r\ncontent-disposition:form-data; name=\ "table sole name \" \r\n\r\n Form value \ r \ n /c13>/// </remarks>         Public byte[] Createfielddata (stringFieldName,stringfieldvalue) {            stringTexttemplate = boundary +"\r\ncontent-disposition:form-data; name=\ "{0}\" \r\n\r\n{1}\r\n"; stringText =String.Format (Texttemplate, FieldName, Fieldvalue); byte[] bytes =encoding.            GetBytes (text); returnbytes; }        /**/        /// <summary>        ///get File Upload form area binary array/// </summary>        /// <param name= "FieldName" >Table sole name</param>        /// <param name= "filename" >file name</param>        /// <param name= "ContentType" >File Type</param>        /// <param name= "ContentLength" >file Length</param>        /// <param name= "Stream" >file Stream</param>        /// <returns>Binary Arrays</returns>         Public byte[] Createfielddata (stringFieldName,stringFileNamestringContentType,byte[] filebytes) {            stringEnd ="\ r \ n"; stringTexttemplate = boundary +"\r\ncontent-disposition:form-data; name=\ "{0}\"; filename=\ "{1}\" \r\ncontent-type: {2}\r\n\r\n"; //Header Data            stringdata =String.Format (texttemplate, fieldName, filename, contentType); byte[] bytes =encoding.            GetBytes (data); //Tail Data            byte[] Endbytes =encoding.            GetBytes (end); //the synthesized array            byte[] FieldData =New byte[Bytes. Length + filebytes.length +Endbytes.length]; bytes. CopyTo (FieldData,0);//Header DataFilebytes.copyto (FieldData, bytes. Length);//Binary data for filesEndbytes.copyto (FieldData, bytes. Length + filebytes.length);//\ r \ n            returnFieldData; }        #regionProperty Public stringBoundary {Get            {                string[] Barray, Ctarray; stringContentType =ContentType; Ctarray= Contenttype.split (';'); if(ctarray[0]. Trim (). ToLower () = ="Multipart/form-data") {Barray= ctarray[1]. Split ('='); return "--"+ barray[1]; }                return NULL; }        }         Public stringContentType {Get            {                if(HttpContext.Current = =NULL)                {                    return "Multipart/form-data, boundary=---------------------------7d5b915500cee"; }                returnHttpContext.Current.Request.ContentType; }        }        #endregion    }

The method is called as follows:

Createbytes cb =Newcreatebytes (); //all form dataArrayList Bytesarray =NewArrayList (); //Normal FormsBytesarray.add (CB. Createfielddata ("Jsondatastr","")); //Read file streamFileStream fs =NewFileStream ("Wolfy. JPG", FileMode.Open, FileAccess.Read, FileShare.Read); stringContentType ="Application/octet-stream"; byte[] Filebytes =New byte[FS.            Length]; Fs. Read (Filebytes,0, Convert.ToInt32 (fs.            Length)); //file FormBytesarray.add (CB. Createfielddata ("file1","Wolfy. JPG", ContentType, filebytes)); Bytesarray.add (CB. Createfielddata ("file2","wolfy1. JPG", ContentType, filebytes)); //synthesize all forms and generate binary arrays            byte[] bytes =CB.            Joinbytes (Bytesarray); //What's returned            byte[] responsebytes; BOOLUploaded = cb. Uploaddata ("Http://localhost:8700/api/System/ImgUpload", Bytes, outResponseBytes);

WebClient implement multi-file/text upload simultaneously