How can we do validations in MVC?

Question

Anupam Mishra · Answer

We are implementing validation in MVC is by using data annotations. Data annotations are nothing but attributes which can be applied on model properties. For example, we have a simple Student class with a property StudentFullName.

This StudentFullName property is tagged with a Required data annotation attribute. In other words if this model is not provided Student FullName, it will not accept it.

public class Student
{
    [Required(ErrorMessage=" Student FullName is required")]
    public string StudentFullName
    {
        set;
        get;
    } 
}

For display of validation error message we need to use the ValidateMessageFor method which belongs to the Html helper class.

@using (Html.BeginForm("StudentFullName", "Home", FormMethod.Post))
{ 
@Html.TextBoxFor(m => m. StudentFullName)
@Html.ValidationMessageFor(m => m. StudentFullName)
.....
}

Later in the controller we can check if the model is proper or not by using the ModelState.IsValid property and accordingly we can take actions.

public ActionResult StudentFullName(Student obj)
{
    if (ModelState.IsValid)
    {
        obj.Save();
        return View("Save Sucessfully");
    }
    else
    {
        return View("Student");
    }
}

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How can we do validations in MVC?

Manoj Bhatt

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