Remote Validation in MVC3, Issue with Null Values

Question

My Model Class as follows:

public class Employee
{
    public Guid ID { get; set; }
    [Required]
    [Remote("CheckName","Employee",ErrorMessage="Already Exists...!")]
    public String EmployeeName { get; set; }
    public String EmployeeAddress { get; set; }
    [Required]
    public DateTime DateOfBirth { get; set; }
    public decimal Salary { get; set; }
    public String Department { get; set; }
    public DateTime HireDate { get; set; }
}

My Action in Controller as Follows:

  [HttpGet]
    public JsonResult CheckName(string Name)
    {
        return Json(Name.Equals("MyString"), JsonRequestBehavior.AllowGet);
    }

When i executed this i am getting a following exception

NullReferenceException: Object reference not set to n instance of an object

In the View, form contains a textbox and a submit button. If You are not clear with these things, please let me know to perform a remote validation.

Rex Miller · Accepted Answer · 2012-03-24 16:42:18Z

3

Not sure how you're rendering the Textbox in question, but if you're using:

@Html.TextboxFor(x => x.EmployeeName) // or
@Html.EditorFor(x => x.EmployeeName) // or
@Html.Textbox("EmployeeName")

The field name of the input will be rendered as <input name="EmployeeName" /> and model binding will not be able to resolve it to the Name parameter of the CheckName method, thus attempting to execute

Name.Equals("MyString")

while Name is null and causing the NullReferenceException. If you change the parameter name of the CheckName method to EmployeeName, that should cause model binding to resolve the parameter to the name of the textbox.

This is all contingent on me understanding the situation and making some assumptions.

answered Mar 24, 2012 at 16:42

Rex Miller

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