How can I create a 2 dimensional dynamic length array?

Question

I want to create a 2-dimensional array, without knowing the size of the first dimension.

For example I have an unknown number of rows, when I create an array. Ever

Answer 1

IMO, since the "columns" are fixed, declare a class for that:

public class Account
{
    public int ID {get;set;}
    public string Name {get;set;}
    public string User {get;set;}
    public string Password {get;set;} // you meant salted hash, right? ;p
}

now have a :

List list = new List();

this has everything you need:

add to list,select,input elements

list.Add etc

using elements in database queries using as parameters in other functions

vague without more info, but you can pass either the Account or invidual values, or the entire list.