How to read the querystring only in the first time?

I have a hierarchical 开发者_如何转开发structure and when the user press on Add a child, I reopen the same page with [Add, ParentID] parameters.

The problem is, after pressing Add, a postback is made and the reading for the querystring is made again because the querystring is still the same and I catch & process it in the page_load.

Note: I can't use IsPostBack because the calling is from the same page, so it' always true.

Any help!

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Make sure you only process the query string when the page has not been posted back, by using the IsPostBack property of Page:

if(!IsPostBack)
{
  //Process query string
}

---

If (!Page.isPostBack) {

//read your query string here

}

---

in the page load event or on you button click add this :

 If Not IsPostBack Then
        'your code here
    End If

C#

if (!IsPostBack) {
//your code here

}

Using session

if (Session("ok") == 0) {
//some code
Session("ok") = 1;}

this will execute your query on the first load only !!!

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in the page load event

add these code and see if it works

if ((!IsPostBack)&&(!IsCallBack)) {
//some code! }

---

if(!IsPostBack)
{
  // Read the query string.
}