c# - Assign value to model property using custom html helper -

my model is

public class fileselectcontrol {     //property selected file path value     public string filepath { get; set; } } 

view

@html.fileboxfor(x => x.filepath) 

where fileboxfor custom html helper class returns html (with input tag)

problem statement : unable assign value in fileselect textbox property filepath. click on browse button of file upload control , , select file, file path value not updated filepath property.

here custom html helper

    public static mvchtmlstring fileboxfor<tmodel, tvalue>(this htmlhelper<tmodel> htmlhelper, expression<func<tmodel, tvalue>> expression)     {         return htmlhelper.fileboxfor<tmodel, tvalue>(expression, (object)null);     }      /// <summary>     /// returns file input element using specified html helper , name of form field expression.     /// </summary>     /// <typeparam name="tmodel">the type of model.</typeparam>     /// <typeparam name="tvalue">the type of value.</typeparam>     /// <param name="htmlhelper">the html helper instance method extends.</param>     /// <param name="expression">the expression resolves name of form field , <see cref="system.web.mvc.viewdatadictionary" /> key used validation errors.</param>     /// <param name="htmlattributes">an object contains html attributes element. attributes retrieved through reflection examining properties of object. object typically created using object initializer syntax.</param>     /// <returns>     /// input element has type attribute set "file".     /// </returns>     public static mvchtmlstring fileboxfor<tmodel, tvalue>(this htmlhelper<tmodel> htmlhelper, expression<func<tmodel, tvalue>> expression, object htmlattributes)     {         return htmlhelper.fileboxfor<tmodel, tvalue>(expression, new routevaluedictionary(htmlattributes));     }      /// <summary>     /// returns file input element using specified html helper , name of form field expression.     /// </summary>     /// <typeparam name="tmodel">the type of model.</typeparam>     /// <typeparam name="tvalue">the type of value.</typeparam>     /// <param name="htmlhelper">the html helper instance method extends.</param>     /// <param name="expression">the expression resolves name of form field , <see cref="system.web.mvc.viewdatadictionary" /> key used validation errors.</param>     /// <param name="htmlattributes">an object contains html attributes element. attributes retrieved through reflection examining properties of object. object typically created using object initializer syntax.</param>     /// <returns>     /// input element has type attribute set "file".     /// </returns>     public static mvchtmlstring fileboxfor<tmodel, tvalue>(this htmlhelper<tmodel> htmlhelper, expression<func<tmodel, tvalue>> expression, idictionary<string, object> htmlattributes)     {         var name = expressionhelper.getexpressiontext(expression);           return htmlhelper.filebox(name, htmlattributes);     }