In this article I will explain with an example, how to return Boolean (BOOL) value from ActionResult (Action Method) in ASP.Net MVC Razor.
In order to return a Boolean (BOOL) value from ActionResult (Action Method), Json function is used in ASP.Net MVC Razor.
Note: For beginners in ASP.Net MVC and jQuery AJAX, please refer my article: ASP.Net MVC: Call Controller Method from View using jQuery AJAX.
I have made use of the following table Customers with the schema as follows. CustomerId is an Auto-Increment (Identity) column.
ASP.Net MVC: Return Boolean (BOOL) value from ActionResult
I have already inserted few records in the table.
ASP.Net MVC: Return Boolean (BOOL) value from ActionResult
Note: You can download the database table SQL by clicking the download link below.
          Download SQL file
Entity Framework Model
Once the Entity Framework is configured and connected to the database table, the Model will look as shown below.
Note: For beginners in ASP.Net MVC and Entity Framework, please refer my article ASP.Net MVC: Simple Entity Framework Tutorial with example. It covers all the information needed for connecting and configuring Entity Framework.
ASP.Net MVC: Return Boolean (BOOL) value from ActionResult
The Controller consists of the following Action methods.
Action method for handling GET operation
Inside this Action method, simply the View is returned.
Action method for Updating data into Database
Inside this Action method, the Customer object is received as parameter. The CustomerId value of the received Customer object is used to reference the Customer record in the Customer Entities.
If the record is found, the values of Name and Country are updated and the changes are updated into the Customers table and a Boolean value TRUE is returned.
If the record is not found, then a Boolean value FALSE is returned.
public class HomeController : Controller
    // GET: Home
    public ActionResult Index()
        return View();
    public ActionResult UpdateCustomer(Customer _customer)
        using (CustomersEntities entities = new CustomersEntities())
            Customer updatedCustomer = (from c in entities.Customers
                                        where c.CustomerId == _customer.CustomerId
                                        select c).FirstOrDefault();
            if (updatedCustomer != null)
                updatedCustomer.Name = _customer.Name;
                updatedCustomer.Country = _customer.Country;
                return Json(true);
        return Json(false);
The View consists of two TextBoxes and a Button. The Button has been assigned with a jQuery Click event handler.
When the Update button is clicked, the values of CustomerId, Name and Country are passed to the UpdateCustomer Action method using jQuery AJAX call.
Once the response is received, based on whether response is TRUE or FALSE, appropriate message is displayed using JavaScript Alert Message Box.
    Layout = null;
<!DOCTYPE html>
    <meta name="viewport" content="width=device-width"/>
    <table border="0" cellpadding="0" cellspacing="0">
            <td style="width: 60px">
                <input type="text" id="txtCustomerId" style="width:50px"/>
            <td style="width: 150px">
                <input type="text" id="txtName" style="width:140px"/>
            <td style="width: 150px">
                <input type="text" id="txtCountry" style="width:140px"/>
            <td style="width: 200px">
                <input type="button" id="btnUpdate" value="Update"/>
    <script type="text/javascript" src=""></script>
    <script type="text/javascript" src=""></script>
    <script type="text/javascript">
        $("body").on("click", "#btnUpdate", function () {
            var _customer = {};
            _customer.CustomerId = $("#txtCustomerId").val();
            _customer.Name = $("#txtName").val();
            _customer.Country = $("#txtCountry").val();
                type: "POST",
                url: "/Home/UpdateCustomer",
                data: JSON.stringify(_customer),
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (r) {
                    if (r) {
                        alert("Customer record updated.");
                    } else {
                        alert("Customer not found.");
ASP.Net MVC: Return Boolean (BOOL) value from ActionResult