Asp.Net MVC Set DropdownList Default Selected Value

Introduction: 

Here I will explain how to set default selected value for dropdownlist in asp.net mvc razor with example or asp.net mvc @Html.Dropdownlist set default selected value in razor with example or asp.net mvc set dropdownlist selected value with example. In asp.net mvc by using @Html.Dropdownlist or @Html.DropdownlistFor properties we can implement dropdownlist and we can easily set dropdownlist default selected value using @Html.Dropdownlist property.

Description:
  
In previous articles I explained asp.net mvc create image gallery with example, asp.net mvc create rdlc report with example, asp.net mvc get dropdownlist selected value example, asp.net mvc set urls for action methods with example, difference between asp.net web api and web service with example, web api in asp.net and consume web api in asp.net with example, asp.net mvc insert data into database with example and many articles relating to asp.net mvc, asp.net, c#,vb.net. Now I will explain how to set default selected value for dropdownlist in asp.net mvc with example.

To set dropdownlist default selected value in asp.net mvc we will write the code like as shown below

@Html.DropDownList("ddlUsers", new SelectList(Model.usersinfo, "UserId", "UserName", 2), "Select User")

Here “DropDownList” function will render it as <select> with <options> tags and “ddlUsers” is used to set id and name for dropdownlist and “Model.usersinfo” will provide all possible options for dropdown and “2” will set default selected value for dropdownlist. Once above dropdown render into html browser that will be like as shown below.

<select id="ddlUsers" name="ddlUsers"> <option value="">Select User</option> <option value="1">Suresh Dasari</option> <option selected="selected" value="2">Rohini Alavala</option> <option value="3">Praveen Kumar</option> <option value="4">Madhav Sai</option> </select>

If you observe above rendered code by default dropdownlist value “2” selected.

We will see how to bind dropdownlist values from database and how to set dropdownlist default selected value with example in asp.net mvc. 

Generally, in asp.net mvc we can implement dropdownlist by using two properties either @Html.DropDownList model or @Html.DropDownListFor model. Before we start implementing first design userdetails table in database and insert some data like as shown below.

Column Name	Data Type	Allow Nulls
userid	Int(IDENTITY=TRUE)	NO
username	varchar(50)	Yes
education	Varchar(50)	Yes
location	Varchar(50)	Yes

Or use following query to create userdetails table in database and insert some data to bind values to dropdownlist.

create table userdetails( userid int primary key identity, username varchar(50), education varchar(50), location varchar(50) ) INSERT INTO userdetails(username,education,location) values('Suresh Dasari','B.Tech','Chennai'), ('Rohini Alavala','Msc','Guntur'), ('Praveen Kumar','B.Tech','Bangalore'), ('Madhav Sai','MBA','Nagpur')

Once we create userdetails table now create asp.net mvc application for that Open visual studio --> Go to File --> Select New --> Project like as shown below

Once we select Project new popup will open in that select Asp.Net Web Application and give name to application and click OK like as shown below

Once click OK new popup will open in that select Empty template and select folders and core reference as MVC and click OK like as shown below

Once we finished creating application our project structure will be like as shown below

Now we will add new model to our application to define properties in our application for that right click on Models folder --> select Add --> select Class like as shown below

Once we click on Class new popup will open in that give name of your model as “UserDetails” and click Add button like as shown below.

Now open newly created model (UserDetails) and write the code like as shown below

using System.Collections.Generic; namespace InsertGetUserDetails.Models { public class UserDetails { public int UserId { get; set; } public string UserName { get; set; } public string Education { get; set; } public string Location { get; set; } public List<UserDetails> usersinfo { get; set; } } }

Now we will add new controller to get data from database for that right click on Controller folder --> select Add --> Controller like as shown below

Once we click on Controller new popup will open in that select MVC 5 Controller – Empty and click Add like as shown below.

Once click on Add new window will open in that enter name of controller and click Add like as shown below

Now open newly created controller and write the code like as shown below

using MVCExamples.Models; using System; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Web.Mvc; namespace MVCExamples.Controllers { public class UserController : Controller { // GET: User public ActionResult Index() { UserDetails objuser = new UserDetails(); DataSet ds = new DataSet(); using (SqlConnection con = new SqlConnection("Data Source=Suresh;Integrated Security=true;Initial Catalog=MySamplesDB")) { using (SqlCommand cmd = new SqlCommand("select * from userdetails", con)) { con.Open(); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); List<UserDetails> userlist = new List<UserDetails>(); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { UserDetails uobj = new UserDetails(); uobj.UserId = Convert.ToInt32(ds.Tables[0].Rows[i]["userid"].ToString()); uobj.UserName = ds.Tables[0].Rows[i]["username"].ToString(); uobj.Education = ds.Tables[0].Rows[i]["education"].ToString(); uobj.Location = ds.Tables[0].Rows[i]["location"].ToString(); userlist.Add(uobj); } objuser.usersinfo = userlist; } con.Close(); } return View(objuser); } } }

If you observe above controller code, we are getting user details from database.

Now we will add view to our controller action method for that right click on Index action method --> select Add View like as shown below

Now give name “Index” to view, select template as “Empty” and select Model class as “UserDetails” which we created in our application then click on Add button like as shown below

 The newly created view will be added under Views folder like as shown below

Now open newly created view and write the code like as shown below

@model MVCExamples.Models.UserDetails @{ Layout = null; } <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>Bind DropdownList Details & Get Selected Value</title> <script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.js"></script> </head> <body> <div> Select User: @Html.DropDownList("ddlUsers", new SelectList(Model.usersinfo, "UserId", "UserName", 2), "Select User")<br /><br /> Selected Text: <label id="lbltxt"></label><br /><br /> Selected Value: <label id="lblid"></label> </div> <script type="text/javascript"> $(function () { if ($("#ddlUsers").val() > 0) { $("#lbltxt").text($("#ddlUsers option:selected").text()); $("#lblid").text($("#ddlUsers").val()); } //Dropdownlist Selectedchange event $('#ddlUsers').change(function () { // Get Dropdownlist seleted item text $("#lbltxt").text($("#ddlUsers option:selected").text()); // Get Dropdownlist selected item value $("#lblid").text($("#ddlUsers").val()); }) }) </script> </body> </html>

Now we will run and see the application result. (url always in the format of http://localhost:portnumber/controller name/action method name) and check the output that would be like as shown below

This is how we can bind dropdownlist in our asp.net mvc applications based on requirement.

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