Saving DropDownList Selected Value Across PostBack in MVC

Let's see how we get a drop down list with the selected value across the post back.

This article is a continuation of my previous article on Populating a Dropdown list in ASP.NET MVC 2 using Entity Framework 4 @ http://www.c-sharpcorner.com/UploadFile/2124ae/5628/

Here I will demonstrate how to get a drop down list with the selected value across the Post back.

We will see how to keep the selected item as selected once we submit the page.

I will be referring to database, Models, Views and Controllers used in my previous article @ (http://www.c-sharpcorner.com/UploadFile/2124ae/5628/) and even the code discussed below will be an addition to the existing sample of the previous article.

1. Update Controllers

• Open the HomeController.cs file from Controllers folder
• Include the Action Result method for Submit where we get the selected value of State drop down and repopulate our dropdownlist.

[HttpPost]
        public ActionResult Index(IndexViewModel postmodel)
        {

            string ddlState_SelectedStateValue = Request.Form["ddlStateId"];
            IList<SelectListItem> iselectList_States = objRepository.GetStateName();
            postmodel.StateValue = new SelectList(iselectList_States, "Value", "Text", ddlState_SelectedStateValue).ToList();
            return View(postmodel);

        }

2. Update Views

• Open Index.aspx from Views -> Home -> Views folder.
  
  ->Include a Submit Button

3. Compile and Run the Project.
Select a State Value and Click Submit

• We can see across Post back – our drop drop down list gets repopulated with the last selected value.
  
  

I have attached the Code for this Sample application.

Happy Learning!

Source collected from Csharpcorner.com 

http://www.c-sharpcorner.com/uploadfile/2124ae/saving-dropdownlist-selected-value-across-postback-in-mvc/