Question

Can somebody please explain to me the difference between:

Session.Add("name",txtName.text); and Session["name"] = txtName.text;

It was an interview question and I answered that both store data in key = "Value" format like Dictionary class in C#.

Am I right, or is there any difference?

Answer 1

Looking at the code for HttpSessionState shows us that they are in fact the same.

public sealed class HttpSessionState : ICollection, IEnumerable
{
    private IHttpSessionState _container;
...
    public void Add(string name, object value)
    {
        this._container[name] = value;
    }

    public object this[string name]
    {
        get
        {
            return this._container[name];
        }
        set
        {
            this._container[name] = value;
        }
    }
...
}

As for them both

Storing data in key = "Value" format like Dictionary class in C#.

They actually store the result in an IHttpSessionState object.