How to correctly validate data in ASP.NET MVC

Question

I am trying to validate my model data which is a text box for string entry but when I try to test with int entry, I get no error and it is saved to the database ...

How can I prevent this?

Model class:

[Required]
public string DeptName { get; set; }

Action method:

public ActionResult Update(Dept model)
{
        if (!ModelState.IsValid)
        {
            return View();
        }

        db.Entry(model).State = EntityState.Modified;
        db.SaveChanges();

        return RedirectToAction("Index");
}

View:

@model Dept

@using (Html.BeginForm())
{
    @Html.HiddenFor(a => a.DeptId);
    @Html.TextBoxFor(a => a.DeptName);
    @Html.ValidationMessageFor(a => a.DeptName);
    <input value="Update" type="submit" class="btn btn-info" />
}

Amaresh Adak · Accepted Answer · 2019-09-01 15:54:48Z

1

If you use only [Required] attribute then its check the value empty or not, It's no check the value type int or string.

If you want to allow the only alphabet characters in a textbox. you can use the regular expression

[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "Use letters only please")]
string DeptName {get; set;}

answered Sep 1, 2019 at 15:54

Amaresh Adak

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Comments

kkica · Accepted Answer · 2019-09-01 00:44:27Z

0

[RegularExpression("[a-zA-Z]*", ErrorMessage = "Cannot be a number")]

edited Sep 1, 2019 at 0:44

answered Sep 1, 2019 at 0:00

kkica

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