@model IEnumerable<WebApplication5.Models.personal>
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<div>
    <select class="form-control" id="fio" >
        @foreach (var tt in Model)
        {
            <option value="@tt.ID">@tt.NAME</option>
        }
        
    </select>

 
    <input id="Text1" type="text" />
   
</div>


Как получить выбранное имя/ид и задать его в параметр, чтобы потом его использовать?

  public class HomeController : Controller
    {
        ProdContextModels db = new ProdContextModels();
        public ActionResult Index()
        {
          
            ViewBag.Personals = new SelectList(db.personal_,  "ID", "NAME");
            return View();
            
        }
        [HttpPost]
        public ActionResult Index(string Personals)
        {
            
            ViewBag.Selected1 = Personals;
            return View();
        }
   
    }

@model IEnumerable<WebApplication5.Models.personal>
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<div>
 @using (Html.BeginForm())
 {      
            @Html.DropDownList("Personals")       

    <input class="btn btn-info"  type="submit" name="name" value="Button" />
 }

</div>

<div>

    fio ------- @ViewBag.Selected1
</div>

@model WebApplication5.Models.personal
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<div>
 @using (Html.BeginForm())
 {      
            @Html.DropDownList("Personals", (IEnumerable<SelectListItem>)ViewBag.Personals, "select")       

    <input class="btn btn-info"  type="submit" name="name" value="Button" />
 }

</div>

<div>

    fio ------- @ViewBag.Selected1
</div>

namespace WebApplication5.Models
{
    
     [Table("personal")]
    public class personal
    {
        
        public string NAME { get; set; }
        public int ID { get; set; }
       
    }
    

}

namespace WebApplication5.Models
{
    
     [Table("personal")]
    public class personal
    {
        
        public string NAME { get; set; }
        public int ID { get; set; }
       
    }
    

}

namespace WebApplication5.Models
{
    public class ProdContextModels : DbContext
    {
        public ProdContextModels() : base("name=WebApplication5")
        {
          /* Database.SetInitializer<ProdContextModels>(null);*/
         
        }
        
        public DbSet<WebApplication5.Models.personal> personal_ { get; set; }
    }
}

namespace WebApplication5.Controllers
{
  
    public class HomeController : Controller
    {
        ProdContextModels db = new ProdContextModels();
        
        public ActionResult Index()
        {
           var x = new personal();
            
            ViewBag.Personals = new SelectList(db.personal_,  "ID", "NAME", 2);
           
            return View(x);
            
        }
        [HttpPost]
        public ActionResult Index(personal Personals)
        {
            ViewBag.Selected1 = Personals;
            return View();
        }
   
    }
}

@model WebApplication5.Models.personal
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<div>
 @using (Html.BeginForm()) 
 {      
         
            @Html.DropDownList(x => x.ID , (IEnumerable<SelectListItem>)ViewBag.Personals, "select")       

    <input class="btn btn-info"  type="submit" name="name" value="Button" />
 }

</div>

<div>

    fio ------- @ViewBag.Selected1
</div>

@model WebApplication5.Models.personal
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<div>
   
    @using (@Html.BeginForm(null, null, FormMethod.Post, new{ @class= "form-group"}))
    {
      
       @Html.DropDownList("ID", ViewBag.Personals as SelectList, "", new { id = "ID", @class = "form-control" })
        
        <input type="submit"  class="btn btn-danger" />
     
    }    

</div>


<div>

    @ViewBag.PerN

    @ViewBag.PP
   
</div>

   public class HomeController : Controller
    {
        ProdContextModels db = new ProdContextModels();
        
        public ActionResult Index()
        {                      
            ViewBag.Personals = new SelectList(db.personal_, "ID", "NAME", 2);           
            return View();            
        }
        [HttpPost]
        public ActionResult Index(personal model)
        {
            ViewBag.Personals = new SelectList(db.personal_, "ID", "NAME", 2);
            ViewBag.PP = model.NAME;           
            ViewBag.PerN = model.ID;
           
            return View(model);
        }
   
    }

     [Table("personal")]
    
    public class personal
    {
        
        public int ID { get; set; }
        public string NAME { get; set; }
       
       
    }

   [HttpPost]
        public ActionResult Index(personal model)
        {
            
            var p = db.personal_.Where(x => x.ID == model.ID).FirstOrDefault();
            ViewBag.LL = p.NAME;
            ViewBag.KK = p.ID;
            ViewBag.Personals = new SelectList(db.personal_, "ID", "NAME", 2);

            return View(model);
        }