In this article I will explain with an example, how to Insert DropDownList value into SQL Server database using Stored Procedure in ASP.Net Core (.Net Core) MVC.
 
 
 

Database

I have made use of the following table Customers with the schema as follows.
ASP.Net Core: Insert DropDownList value into Database using Stored Procedure
 
Note: You can download the database table SQL by clicking the download link below.
           Download SQL file
 
 

Stored Procedure

The following Stored Procedure will be used to Insert data into the SQL Server database table.
This Stored Procedure accepts Name and Country parameters, which are used to Insert the records in Customers Table.
CREATE PROCEDURE [dbo].[Customers_InsertCustomer]
       @Name VARCHAR(100),
       @Country VARCHAR(50)
AS
BEGIN
      INSERT INTO [Customers]
                  ([Name]
                  ,[Country])
      VALUES
                 (@Name
                 ,@Country)
 
      SELECT SCOPE_IDENTITY()
END
 
 

Model

The Model class consists of following properties.
public class CustomerModel
{
    public int CustomerId { get; set; }
    public string Name { get; set; }
    public string Country { get; set; }
}
 
 

Namespaces

You will need to import the following namespaces.
using System.Data;
using System.Data.SqlClient;
 
 

Controller

Inside the Controller, first the public property of IConfiguration interface is created.
Then, the IConfiguration interface is injected into the Constructor (HomeController) using Dependency Injection method and the injected object is assigned to the public property of IConfiguration interface.
The Controller consists of following Action methods.

Action method for handling GET operation

Inside this Action method, simply the View is returned.
 

Action method for handling POST operation

This method accepts CustomerModel object as a parameter.
Inside the Action Method, the connection is read from the ConnectionStrings section of the AppSettings.json file.
Note: For more details on how to read Connection String from AppSettings.json, please refer my article .Net Core 7: Read Connection String from AppSettings.json file.
 
Then, an object of SqlCommand class is created and the name of the Stored Procedure is passed to it as parameter.
The Name and Country values are fetched from their respective TextBoxes using CustomerModel class object and passed as parameters to SqlCommand object.
The ExecuteScalar function is executed and the records are inserted into the SQL Server database and the CustomerModel class object is returned to the View.
Note: For more details on how to use ExecuteScalar function, please refer Understanding SqlCommand ExecuteScalar in C# and VB.Net.
 
public class HomeController : Controller
{
    public IConfiguration Configuration { get; set; }
 
    public HomeController(IConfiguration _configuration)
    {
        this.Configuration = _configuration;
    }
 
    public IActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public IActionResult Index(CustomerModel customer)
    {
        string spName = "Customers_InsertCustomer";
        string constr = this.Configuration.GetSection("ConnectionStrings")["MyConn"];
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand(spName, con))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@Name", customer.Name);
                cmd.Parameters.AddWithValue("@Country", customer.Country);
                con.Open();
                customer.CustomerId = Convert.ToInt32(cmd.ExecuteScalar());
                con.Close();
            }
        }
        return View(customer);
    }
}
 
 

View

HTML Markup

Inside the View, in the very first line the CustomerModel class is declared as Model for the View.
The View consists of an HTML Form which has been created using the following TagHelpers attributes.
asp-action – Name of the Action. In this case the name is Index.
asp-controller – Name of the Controller. In this case the name is Home.
method – It specifies the Form Method i.e. GET or POST. In this case it will be set to POST.
The View also consists of an HTML Table, which consists of an HTML INPUT TextBox and HTML SELECT (DropDownList) and a Submit Button.
Then, the CustomerModel is checked for NULL and if it is not NULL then, the value of the CustomerModel is displayed using JavaScript Alert Message Box.
Inside the View, the following script file is inherited:
1. jquery.min.js
 

Submitting the Form

When the Submit Button is clicked then, the CustomerModel class object is checked for NULL and if it is not NULL then, the CustomerId is displayed using JavaScript Alert Message Box.
@model Insert_SP_Core.Models.CustomerModel
@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@{
     Layout = null;
}
 
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <form method="post" asp-controller="Home" asp-action="Index">
        <table cellpadding="0" cellspacing="0">
            <tr>
                <td>Name:</td>
                <td>
                    <input type="text" asp-for="Name" />
                </td>
            </tr>
            <tr>
                <td>Country:</td>
                <td>
                    <select asp-for="Country">
                        <option value="Please select">Please select</option>
                        <option value="United States">United States</option>
                        <option value="India">India</option>
                        <option value="France">France</option>
                        <option value="Russia">Russia</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" value="Submit" /></td>
            </tr>
        </table>
    </form>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
    @if (Model != null)
    {
        <script type="text/javascript">
            $(function () {
                alert("Inserted Customer ID: " + @Model.CustomerId);
            });
        </script>
    }
</body>
</html>
 
 

Screenshots

The Form

ASP.Net Core: Insert DropDownList value into Database using Stored Procedure
 

Record after Insert in database

ASP.Net Core: Insert DropDownList value into Database using Stored Procedure
 
 

Downloads

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