In this article I will explain with an example, how to clear Model Fields such as TextBox, DropDownList, RadioButtons, CheckBoxes, ListBox etc. after Form Submit in ASP.Net MVC Razor.
The Form Fields which are created using Model class retain the values even after Form submission and hence to clear such Form Fields, Model state needs to be cleared.
Note: For beginners in ASP.Net MVC, please refer my article ASP.Net MVC Hello World Tutorial with Sample Program example.
 
 

Model

The following is a Model class named PersonModel with four properties i.e. PersonId, Name, Gender and City.
public class PersonModel
{
    /// <summary>
    /// Gets or sets PersonId.
    /// </summary>
    public int PersonId { get; set; }
 
    /// <summary>
    /// Gets or sets Name.
    /// </summary>
    public string Name { get; set; }
 
    /// <summary>
    /// Gets or sets Gender.
    /// </summary>
    public string Gender { get; set; }
 
    /// <summary>
    /// Gets or sets City.
    /// </summary>
    public string City { get; set; }
}
 
 

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 displaying POST operation

This Action method, has PersonModel class as parameter.
Then values posted from the Form inside the View are received through this parameter.
Finally, Form Fields which are created using Model class are cleared by clearing the Model using ModelState.Clear function.
public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public ActionResult Index(PersonModel person)
    {
        int personId = person.PersonId;
        string name = person.Name;
        string gender = person.Gender;
        string city = person.City;
 
        //Insert to database.
 
        //Clear the Model.
        ModelState.Clear();
 
        return View();
    }
}
 
 

View

Inside the View, in the very first line the PersonModel 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.
There are three TextBox fields created for capturing values for PersonId, Name and City using the Html.TextBoxFor method. While for capturing the Gender value, a DropDownList with three options is created using the Html.DropDownListFor function.
Then, also a Submit Button at the end of the Form and when the Button is clicked, the Form is submitted.
@model Clear_TextBox_After_Submit_MVC.Models.PersonModel
 
@{
     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="0" cellspacing="0">
            <tr>
                <th colspan="2" align="center">Person Details</th>
            </tr>
            <tr>
                <td>PersonId:</td>
                <td>
                    @Html.TextBoxFor(m => m.PersonId)
                </td>
            </tr>
            <tr>
                <td>Name:</td>
                <td>
                    @Html.TextBoxFor(m => m.Name)
                </td>
            </tr>
            <tr>
                <td>Gender:</td>
                <td>
                    @Html.DropDownListFor(m =>m.Gender, new List<SelectListItem>
                   { new SelectListItem{Text= "Male", Value= "M"},
                     new SelectListItem{Text= "Female", Value= "F"}}, "Please select")
                </td>
            </tr>
            <tr>
                <td>City: </td>
                <td>
                    @Html.TextBoxFor(m => m.City)
                </td>
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" value="Submit" /></td>
            </tr>
        </table>
    }
</body>
</html>
 
 

Screenshot

Clear Model Fields (TextBox, DropDownList) after Form Submit in ASP.Net MVC
 
 

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