'entityframework.models.foreig...

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WPF

C#5.0

I am developing an app in WPF that is going to make use of entity framework CRUD operations, but am stuck at a line of code and could not proceed. in one of the classes there is a red underline on "[Foreignkey("DepId")]" with an error message "'entityframework.models.foreignkeyAttribute' does not contain a constructor that takes one argument" below is the whole code

namespace EntityFramework.Models
{
class Employee
{
public int id { get; set; }

public string FirstName { get; set; }

public string LastName { get; set; }

public string BirthDay { get; set; }

public string DepId { get; set; }

[Foreignkey("DepId")]
public virtual Departments Departments { get; set; }
}
}

Kindly help thank you in advance