helloi want to pass LinQ query below instead of in line select statementvar cat from ct in dbcategories select catmodelFirstLevel PopulateDropDown34SELECT CountryId CountryName FROM Countries34 34CountryName34 34CountryId34return Viewmodel private static ListltSelectListItemgt PopulateDropDownstring query string textColumn string valueColumn ListltSelectListItemgt items new ListltSelectListItemgt

Populate DropDownList from Database using Entity Framework and Linq query in ASP.Net MVC

nauna

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User: nauna
Posted: on Jun 12, 2019 02:01 AM
Forum: Entity Framework
Answer: 1
Views: 8350
Sample Code: Download

hello,

i want to pass LinQ query below instead of in line select statement

var cat = (from ct in db.categories
           select cat);
model.FirstLevel = PopulateDropDown("SELECT CountryId, CountryName FROM Countries", "CountryName", "CountryId");
return View(model);

        private static List<SelectListItem> PopulateDropDown(string query, string textColumn, string valueColumn)
        {
            List<SelectListItem> items = new List<SelectListItem>();
            string constr = ConfigurationManager.ConnectionStrings["Default"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand(query))
                {
                    cmd.Connection = con;
                    con.Open();
                    using (SqlDataReader sdr = cmd.ExecuteReader())
                    {
                        while (sdr.Read())
                        {
                            items.Add(new SelectListItem
                            {
                                Text = sdr[textColumn].ToString(),
                                Value = sdr[valueColumn].ToString()
                            });
                        }
                    }
                    con.Close();
                }
            }

            return items;
        }

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dharmend...

0 2

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ANSWER
User: dharmendr
Replied: on Jun 12, 2019 02:56 AM
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Hi nauna,

Check this example. Now please take its reference and correct your code.

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

Model

public class DetailModel
{
    public int Id { get; set; }
    public List<SelectListItem> Country { get; set; }
}

Controller

public class HomeController : Controller
{
    // GET: /Home/
    public ActionResult Index()
    {
        DetailModel model = new DetailModel();
        NorthwindEntities entities = new NorthwindEntities();
        model.Country = (from country in entities.Employees
                            select new SelectListItem()
                            {
                                Text = country.Country,
                                Value = country.Country
                            }).Distinct().ToList();
        return View(model);
    }
}

View

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<_Populate_DropDownList_Linq.Models.DetailModel>" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Index</title>
</head>
<body>
    <div><%:Html.DropDownListFor(m => m.Country, Model.Country, "Select", new { style = "width:150px;" })%></div>
</body>
</html>

Sceenshot

I agree, here is the link: https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html

Populate DropDownList from Database using Entity Framework and Linq query in ASP.Net MVC

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