Question

Here are 3 scenarios:

namespace NS
{
    public partial class A: System.Web.UI.UserControl
    private Variable v;
    protected void Page_Load(object sender, EventArgs e){
        if (!Page.IsPostBack) v= new Variable();
        ....
    }
}

namespace NS
{
    public partial class A: System.Web.UI.UserControl
    private Variable v = new Variable();
    protected void Page_Load(object sender, EventArgs e){
    }
}

namespace NS
{
    public partial class A: System.Web.UI.UserControl
    private Variable v;
    protected void Page_Load(object sender, EventArgs e){
        v = new Variable();
    }
}

When does the variable “v” gets created every time for the 2nd scenario? Is the 2st scenario is equivalent to the 3rd one?

Answer 1

Scenario 1:
the variable v is intialized on every request, when page load happens, and there is no post back. (otherwise null)

scenario 2:
the variable v is initialized on every instantiation of the class A, bevore the constructor is called.

scenario 3:
the variable v is intialized on every request, when page load happens.

comment:
if you access the variable v only after page load happens, then scenario 2 & 3 can be treated equal.