asp.net mvc - How to create MVC 4 @Html.TextBox type="file"? -

i need add following field @ form

<input type="file" class="input-file" /> 

i create model , describe field (the last field)

 using system;  using system.collections.generic;  using system.linq;  using system.web;   namespace corepartners_site2.models  {      public class feedbackform      {     public string name { get; set; }     public string email { get; set; }     public string phone { get; set; }     public string company { get; set; }     public string additionalinformation { get; set; }     public httppostedfilebase projectinformation { get; set; }      }  } 

and create

@html.textbox(null, null, new { type="file", @class="input-file" }) 

but doesnt work, exception. what's wrong?

model

public class feedbackform {     public string name { get; set; }     public string email { get; set; }     public string phone { get; set; }     public string company { get; set; }     public string additionalinformation { get; set; }     public httppostedfilebase projectinformation { get; set; } } 

view

@model feedbackform  @html.textbox("name") @html.textbox("email") ... @html.textbox("projectinformation", null, new { type="file", @class="input-file" })  // submit button 

my recommended view (strongly - typed)

@model feedbackform  @html.textboxfor(model=>model.name) @html.textboxfor(model=>model.email) ... @html.textboxfor(model=>model.projectinformation, null, new { type="file", @class="input-file" })  // submit button 

controller

[httppost] public actionresult feedbackform(feedbackform model) {     // uploaded file     var file = model.projectinformation;     ...      return view(); } 

mvc using name conversation, if use same variable names textbox model, mvc bind inputs model.