Question

I am using ASP.net in my project.

I Declare a Variable btn_clik, tot at the beginning of Class.

 public partial class Table : System.Web.UI.Page
    {
        public int btn_click = 1, tot = 0;

I have two button, Up And Down. When I click Up button btn_click variable want to decrease. And Down Button btn_click variable want to increase.

 protected void btnUp_Click(object sender, EventArgs e)
 {
            if (btn_click != 1) { btn_click--;}              
 }

 protected void btnDown_Click(object sender, EventArgs e)
 {
       if (btn_click < tot) { btn_click++;}               
 }

But At the Page load,.. btn_click vale is 1; then I Click Down Button,.. btn_click value is 2. I repeat the Down Button Click,.. But btn_click value is still 2; I Check that with breakpoints. Each Time btn_click Variable is going to 1, At that time of Button Click.

What is the Mistake…

Answer 1

ASP.Net instances do not persist across HTTP requests.
Each requests gets a new instance of your page class.

You need to store the value in session state or viewstate.