In this article I will explain with an example, how to delete data from MySQL database using Dapper library in ASP.Net MVC.
Note: For beginners in ASP.Net MVC, please refer my article ASP.Net MVC 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.
ASP.Net MVC: Delete from MySQL Database using Dapper
 
I have already inserted few records in the table.
ASP.Net MVC: Delete from MySQL Database using Dapper
 
Note: You can download the database table SQL by clicking the download link below.
           Download SQL file
 
 

Model

The Model class consists of following property.
public class CustomerModel
{
    public int CustomerId { get; set; }
}
 
 

Namespaces

You will need to import the following namespaces.
using Dapper;
using System.Configuration;
using MySql.Data.MySqlClient;
 
 

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 Web.Config file.
Note: For more details on how to read connection string from Web.Config file, please refer my article Read or Write Connection Strings in Web.Config file using ASP.Net using C# and VB.Net.
 
Then, SQL query and the CustomerModel class object is passed to the Execute method of the Dapper library which then deletes the record from the Customers Table.
Note: For more details on Execute method, please refer my article Understanding Dapper Execute in MySQL in C# and VB.Net.
 
Finally, based on whether the record is deleted or not an appropriate message is set into ViewBag object and View is returned.
public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public ActionResult Index(CustomerModel customer)
    {
        string sql = "DELETE FROM Customers WHERE CustomerId = @CustomerId";
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (MySqlConnection con = new MySqlConnection(constr))
        {
            int i = con.Execute(sql, customer);
            if (i > 0)
            {
                ViewBag.Message = "Customer record deleted.";
            }
            else
            {
                ViewBag.Message = "Customer not found.";
            }
        }
        return View();
    }
}
 
 

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 Html.BeginForm method with the following parameters.
ActionName – Name of the Action. In this case the name is Index.
ControllerName – Name of the Controller. In this case the name is Home.
FormMethod – 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 a TextBox created using Html.TextBoxFor method and a Submit Button.
 

Submitting the Form

When the Submit Button is clicked then, the ViewBag object is checked for NULL and if it is not NULL then, the value of the ViewBag object is displayed using JavaScript Alert Message Box.
@model Dapper_Delete_MySQL_MVC.Models.CustomerModel
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    @using (Html.BeginForm("Index", "Home", FormMethod.Post))
    {
        <table cellpadding="1" cellspacing="1">
            <tr>
                <td style="width: 60px">
                    Id<br />
                    @Html.TextBoxFor(m => m.CustomerId, new { Style = "width:30px;" })
                </td>
                <td style="width: 200px">
                    <br />
                    <input type="submit" value="Delete" />
                </td>
            </tr>
        </table>
        if (ViewBag.Message != null)
        {
            <script type="text/javascript">
                window.onload = function () {
                    alert("@ViewBag.Message");
                };
            </script>
        }
    }
</body>
</html>
 
 

Screenshot

ASP.Net MVC: Delete from MySQL Database using Dapper
 
 

Downloads

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