In this article I will explain with an example, how to insert data into database using Dapper library in ASP.Net Core MVC.
Note: For beginners in ASP.Net Core (.Net Core 7), please refer my article ASP.Net Core 7: Hello World Tutorial with Sample Program example.
 
 

Installing Dapper package using Nuget

In order to install Dapper library using Nuget, please refer my article Install Dapper from Nuget in Visual Studio.
 
 

Database

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

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 Dapper;
using System.Data.SqlClient;
 
 

Controller

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 class object as a parameter.
Inside this Action method, first the connection is read from the ConnectionStrings section of the AppSettings.json file.
The CustomerModel class object is created and Name and Country values are set.
Then, using ExecuteScalar method of Dapper library, the record is inserted into the SQL Server database.
Note: For more details on ExecuteScalar method, please refer my article Understanding Dapper ExecuteScalar in C# and VB.Net.
 
Finally, the CustomerId of the inserted record is set and the CustomerModel class object is returned to the View.
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 sql = "INSERT INTO Customers VALUES(@Name, @Country)";
        sql += " SELECT SCOPE_IDENTITY()";
        string constr = this.Configuration.GetSection("ConnectionStrings")["MyConn"];
        using (SqlConnection con = new SqlConnection(constr))
        {
            customer = new CustomerModel
            {
                Name = customer.Name,
                Country = customer.Country
            };
            customer.CustomerId = Convert.ToInt32(con.ExecuteScalar(sql, customer));
        }
        return View(customer);
    }
}
 
 

View

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.
Inside the View, the following JS script is inherited:
1. jquery.min.js
 
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 Dapper_Insert_Core_MVC.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

Insert using Dapper in ASP.Net Core
 

Record after Insert in database

Insert using Dapper in ASP.Net Core
 
 

Downloads

Download Code