Does This ASP.NET Consultant Know What He's Doing?

void MyFunction()
{
    Session["UserID"] = SomeProprietarySessionManagementLookup();
    Response.Redirect("SomeOtherPage.aspx");
}

int MyFunction(int x, int x)
{
    try
    {
        return x / y;
    }
    catch(Exception ex)
    {
        // log it
        throw;
    }
}

int MyFunction(int x, int y, out bool isSuccessful)
  {
    isSuccessful = false;

    if (y == 0)
        return 0;

    isSuccessful = true;

    return x / y;
  }

int MyFunction(int x, int y)
{
    if (y == 0)
    {
        // log it
        throw new DivideByZeroException("Divide by zero attempted!");
    }

    return x / y;
}

Session["UserID"] = SomeProprietarySessionManagementLookup();

public void SomeProprietarySessionManagementLookup()
{
    // do some async lookup
    Action<object> d = delegate(object val)
    {
        LookupSession(); // long running thing that looks up the user.
        Session["UserID"] = 1234; // Setting session manually
    };

    d.BeginInvoke(null,null,null);
}

Action<object> d = delegate(object val)
{
    System.Threading.Thread.Sleep(1000);  // waits a little
    Session["rubbish"] = DateTime.Now;
};

d.BeginInvoke(null, null, null);
System.Threading.Thread.Sleep(5000);      // waits a lot

object stuff = Session["rubbish"];
if( stuff == null ) stuff = "not there";
divStuff.InnerHtml = Convert.ToString(stuff);

Action<object> d = delegate(object val)
{
    System.Threading.Thread.Sleep(5000);  // waits a lot
    Session["rubbish"] = DateTime.Now;
};

d.BeginInvoke(null, null, null);

// wait removed - ends immediately.
object stuff = Session["rubbish"];
if( stuff == null ) stuff = "not there";
divStuff.InnerHtml = Convert.ToString(stuff);

Session["UserID"] = SomeProprietarySessionManagementLookup();

SomeProprietarySessionManagementLookup(Session["UserID"]);