Asp.net variables values

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...

SLaks · Accepted Answer · 2012-02-17 17:35:14Z

3

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.

answered Feb 17, 2012 at 17:35

SLaks

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3 Comments

JonH Over a year ago

I guess adding "totally" makes something more irrelevant.

Sagotharan Over a year ago

NanDri(Thanks in Tamil Language).

user1173363 Over a year ago

Where I Can Read the Basic Things of ASP.NET?.

Pankaj · Accepted Answer · 2012-02-17 19:37:54Z

2

You should not use Session variables in this context. Replace you code from session variables to ViewState variables. @SLaks, I hope you are agreed with this. Obviously this is doing the same job BUT with good approach

Below is the sample code...

 protected void btnUp_Click(object sender, EventArgs e)
 {
      if (ViewState["btn_click"] == null)
            btn_click = 0;
        else
            btn_click = (int)ViewState["btn_click"];
      if (btn_click != 1) { btn_click--;} 
      ViewState["btn_click"] = btn_click;

 }

Check the differences between Session and ViewState below are the References

Session Vs ViewState

edited Feb 17, 2012 at 19:37

answered Feb 17, 2012 at 19:16

Pankaj

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