How to get DropDownList SelectedValue in Controller in MVC?

Question

How to get DropDownList SelectedValue in Controller in get method without page load in MVC?

 

@Html.DropDownList("insitudename", ViewBag.insitudename as List<SelectListItem>, "Select Institute", new { @class = "form-control", onchange = "student_verification(this.value);" })

 

[HttpGet]

public ActionResult student_verification(MdStdNew objst, string stateId)

{

 return View(objst);

} 

 

 

but in this selected drop down list item data is not binding in a table . why??

 i have use json method also. bt data is not binding in a table in mvc. 

can some one help me?