In this article I will explain with an example, how to delete the data from database using Dapper library in ASP.Net MVC.
 
 

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.
 
I have already inserted few records in the table.
 
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 Customer
{
    public int CustomerId { get; set; }
}
 
 

Namespaces

You will need to import the following namespaces.
using Dapper;
using System.Configuration;
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 Customer object as a parameter.
Inside this Action method, the Execute method of Dapper library is used to delete the record from Customers Table.
Note: For more details on Execute method, please refer my article Understanding Dapper Execute in C# and VB.Net.
 
Finally, a check is performed and appropriate message is set into ViewBag object.
public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public ActionResult Index(Customer customer)
    {
        string sql = "DELETE FROM Customers WHERE CustomerId = @CustomerId";
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            int i = con.Execute(sql, customer);
            if (i > 0)
            {
                ViewBag.Message = "Customer record deleted.";
            }
            else
            {
                ViewBag.Message = "Customer not found.";
            }
        }
        return View();
    }
}
 
 

View

Inside the View, in the very first line the Customer 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.
Finally, 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_MVC.Models.Customer
@{
    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:50px;" })
                </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

Delete using Dapper in ASP.Net MVC
 
 

Downloads

Download Code