I am completely new to web development. So sorry for this lame question.

@foreach(){
<tr>
   <td> <input type="checkbox" name="nameOfCheckBox" /> </td>
   <td> Name </td>
   <td> ID </td> 
   <td> DATA </td>
</tr>
}

now as many data are in database that many will be in my view in user side. So now if my user only wants to download two or three or multiple files how to proceed in this case. Since I am new to web I would really appreciate your answers divided into frontend and backend separately. Like what to do in frontend part and what to do in backend part. Using C#(.net) as backend language.