Dependency Injection in .NET with examples?

Question

Can someone explain dependency injection with a basic .NET example and provide a few links to .NET resources to extend on

Answer 1

Create DB layer project(class library) and add below code in it.

public class UserData : IUserData
{
    public string getUserDetails()
    {
        return "Asif";
    }
}

public interface IUserData
{
    string getUserDetails();
}