asp.net mvc 4 - Instances of abstract classes cannot be created when uploading -


when try upload('xlsx','csv') format, invalidoperationexception: instances of abstract classes cannot created.

here controller

    public actionresult upload()     {         return view();     }     [httppost]     public actionresult upload(httppostedfilebase fileupload)     {         if (fileupload.contentlength > 0)         {             string filename = path.getfilename(fileupload.filename);             string path = path.combine(system.web.httpcontext.current.server.mappath("~/app_data/uploads"), filename);             try             {                 fileupload.saveas(path);                 viewdata["feedback"] = "upload complete";             }             catch (exception ex)             {                 viewdata["feedback"] = ex.message;             }         }          return view("upload", viewdata["feedback"]);     }

here view

@{ viewbag.title = "file"; }  <h2>upload file</h2> @using (html.beginform("upload", "ofnpage", formmethod.post, new { enctype = "multipart/form-data" })) { <input type="file" name="fileupload" /> <input type="submit" name="submit" id="submit" value="upload" /> <br><br> @viewbag.message }

can me edit or guide me troubleshoot them?


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