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Friday, 8 September 2017

Access DropDownList and DropDownListFor Value From View To Controller In Asp.Net MVC, C#.Net

9/08/2017 - By Pranav Singh 0

In this article I will show you how you can how you can access dropdownlist and dropdownlistfor value from view to controller in mvc, c#.net. I will show separate dropdownlist and dropdownlistfor selected value.


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVC_Demos.Models
{
    public class StudentModel
    {
        public List<Student> StudentList { get; set; }
        public int SelectedStudentId { get; set; }
    }
    public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}
After this we will add a controller class file. In this we will create some list value for showing in dropdown list.
    public ActionResult Index()
        {
            StudentModel _studentmodel = new StudentModel();
            _studentmodel.StudentList = new List<Student>();
            _studentmodel.StudentList.Add(new Student { Id = 1, Name = "Student1" });
            _studentmodel.StudentList.Add(new Student { Id = 2, Name = "Student2" });
            _studentmodel.StudentList.Add(new Student { Id = 3, Name = "Student3" });
            return View(_studentmodel);
        }

Now first we will check for

DropDownListFor:

         ///


        /// Example for DropDownList
        /// 
        ///
        [HttpPost]
        public ActionResult Index(StudentModel _studentmodel)
        {
            _studentmodel.StudentList = new List<Student>();
            _studentmodel.StudentList.Add(new Student { Id = 1, Name = "Student1" });
            _studentmodel.StudentList.Add(new Student { Id = 2, Name = "Student2" });
            _studentmodel.StudentList.Add(new Student { Id = 3, Name = "Student3" });
            return View(_studentmodel);
        }

      
Here in above code I have passed the student model class as parameter. Now generate the view and add the below code.

@model MVC_Demos.Models.StudentModel
@{
    ViewBag.Title = "Index";
}

@using (Html.BeginForm("Index", "DropDownList"))
{
    <b>Example Of DropDownListFor </b><br />
    @Html.DropDownListFor(m=>m.SelectedStudentId, new SelectList(Model.StudentList, "Id", "Name"), "Select Name")<br />
    <input type="submit" value="Submit" />
}


In above code I have bind the dropdownlistfor with model. Now run it and check the output.

DropDownList:

For this add the below code.

         ///


        /// Example for DropDownList
       ///
        ///
        [HttpPost]
        public ActionResult Index(string SelectedStudentId)
        {
            StudentModel _studentmodel = new StudentModel();
            _studentmodel.StudentList = new List<Student>();
            _studentmodel.StudentList.Add(new Student { Id = 1, Name = "Student1" });
            _studentmodel.StudentList.Add(new Student { Id = 2, Name = "Student2" });
            _studentmodel.StudentList.Add(new Student { Id = 3, Name = "Student3" });
            return View(_studentmodel);
        }

        
Now we will create view and add the below code.

@model MVC_Demos.Models.StudentModel
@{
    ViewBag.Title = "Index";
}

@using (Html.BeginForm("Index", "DropDownList"))
{
  <b>Example Of DropDownList </b><br />
    @Html.DropDownList("SelectedStudentId", new SelectList(Model.StudentList, "Id", "Name"), "Select Name")<br />
    <input type="submit" value="Submit" />
}


Here in above code you can check the name of dropdownlist is same as the parameter passed into the index post method.

Now run it and check the output.



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