c# - Image not saving when updated in view -

while developing asp.net mvc 4 application ran problem updating saved image. when user selects edit tab, re-directed content entered. 1 such item of content image, , when in edit menu can choose replace existing image. have other content updating correctly image remains same, when place breakpoint on "edit" actionresult, show image value passing model null? newsarticle.articleimage = null

fyi - image saved byte array.

am missing ?

controller....

    [httppost]     public actionresult edit(newsarticle newsarticle, int id, httppostedfilebase article)     {         try         {             if (modelstate.isvalid)             {                newsarticle savedarticle= _newsarticle.get(id);               savedarticle.body = newsarticle.body;              savedarticle.title = newsarticle.title;               if (newsarticle.articleimage == null)              {                  newsarticle.articleimage = savedarticle.articleimage;              }              else              {                  using (var binaryreader = new binaryreader(request.files[0].inputstream))                  {                      newsarticle.articleimage = binaryreader.readbytes(request.files[0].contentlength);                  }                   savedarticle.articleimage = newsarticle.articleimage;              }               if (newsarticle.imagename == null)              {                  newsarticle.imagename = savedarticle.imagename;              }              else              {                  string imgename = path.getfilename(article.filename);                   savedarticle.imagename = imgename;               }               _uow.savechanges();                 return redirecttoaction("index");             }         }         catch (system.data.dataexception)         {             //log th error(add variable name after dataexpection)             modelstate.addmodelerror("", "unable save changes. try again, , if problem persists see system administrator.");         }          return view(newsarticle);     } 

view..........

         @using (html.beginform("edit", "admin", formmethod.post, new { enctype = "multipart/form-data", @class = "form-horizontal", id = "newseditform" })) {      @html.validationsummary()      @html.hiddenfor(model => model.id)       <div class="control-group">         <label class="control-label">posted on :</label>         <div class="controls">             <span class="text">@model.datecreated.value.toshortdatestring()</span>             @*@html.labelfor(n => n.datecreated)*@         </div>     </div>       <div class="control-group">         <label class="control-label">@html.labelfor(n => n.title)</label>         <div class="controls">              @html.textboxfor(n => n.title, new { @class = "span4 m-wrap", rows = 1 })           </div>     </div>       <div class="control-group">         <label class="control-label">@html.labelfor(n => n.body)</label>         <div class="controls">             @html.textareafor(n => n.body, new { @class = "span12 ckeditor m-wrap", rows = 4 })          </div>     </div>       <div class="control-group">         <label class="controls">@html.displaytextfor(model => model.imagename)</label>         <div class="span4 blog-img blog-tag-data">             <div class="editor-field">                 <input type="file" name="article" id="articleimage" />             </div>         </div>     </div>      <div class="form-actions">          <button type="submit" class="btn green" id="submitnews"><i class="icon-ok"></i>submit</button>         @html.actionlink("cancel", "articlelist", "admin", null, new { @class = "btn blue" })         @*<button type="button" class="btn blue" onclick="location.href='articlelist','admin'">cancel</button>*@      </div>                    }