I have some code which keeps track of the number of times a button has been clicked. As a matter of fact, when the page first loads, a counter is set to 0. On every postback, the counter is incremented by 1. I have only one button on the page.

The main idea behind this is to allow the user to enter some details 4 times. If he enters invalid details for 4 times, he is redirected to an error page. Otherwise, he is redirected to a confirmation page.

This is my code:

                if (!this.IsPostBack)
                {
                    Session["Count"] = 0;
                }

                else
                {
                    if (Session["Count"] == null)
                    {
                        Session.Abandon();
                        Response.Redirect("CheckOutErrorPage.htm");
                    }

                    else
                    {
                        int count = (int)Session["Count"];

                        if (count == 3)
                        {
                            Session.Abandon();
                            Response.Redirect("CheckOutFailure.aspx");
                        }

                        else
                        {
                            count++;
                            Session["Count"] = count;
                        }
                    }
                }

Everything works as it should except that if the user enter invalid details for 3 times and then he enters VALID details on the 4th time, the user is redirected to the Error Page (because he has tried 4 times) instead of the confirmation page.

How can I solve this please?