Amit Kumar Amit Kumar - 4 years ago 344
C# Question

MVC : The parameters dictionary contains a null entry for parameter 'k' of non-nullable type 'System.Int32'

I am new to

. In My Application , I'm Retrieving the Data from Mydatabase. but when I run my Application it show Error Like This
this is my url


Exception Details: System.ArgumentException: The parameters dictionary contains a null entry for parameter 'k' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult DetailsData(Int32)' in 'MVCViewDemo.Controllers.EmployeeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters

this is my web.config file code

<add name="EmployeeContext" connectionString="Server=.;Database=mytry;integrated security=true; ProviderName=System.Data.SqlClient"/>

this is my Employee Model Class(Employee.cs)

[Table("emp")] /* to map tablename with our class name*/
public class Employee
public int EmpId { get; set; }
public string Name { get; set; }
public string Gender { get; set; }
public string City { get; set; }


My EmployeeContext.cs Model class

public class EmployeeContext:DbContext
public DbSet<Employee> Employees { get; set; }

my EmployeeController.cs

public ActionResult DetailsData(int k)

EmployeeContext Ec = new EmployeeContext();
Employee emp = Ec.Employees.Single(X => X.EmpId == k);
return View(emp);

and my view

@Model.Name<br />
@Model.City<br />
@Model.Gender<br />

Answer Source

It appears that you are using the default route which is defined as this:

    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }

The key part of that route is the {id} piece. If you look at your action method, your parameter is k instead of id. You need to change your action method to this so that it matches the route parameter:

// change int k to int id
public ActionResult DetailsData(int id)

If you wanted to leave your parameter as k, then you would change the URL to be:


You also appear to have a problem with your connection string. In your web.config, you need to change your connection string to this (provided by haim770 in another answer that he deleted):

  <add name="EmployeeContext"
       connectionString="Server=.;Database=mytry;integrated security=True;"
       providerName="System.Data.SqlClient" />
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