very simple problem but i am unable resolve it.variable is unable to be shared among methods

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C#

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    List<string> d= new List<string>();
    protected void Button1_Click1(object sender, EventArgs e)
    {
        d.Add(TextBox1.Text);
        d.Add(TextBox2.Text);
        d.Add(TextBox3.Text);
        d.Add(TextBox4.Text);
    }   
    protected void Button2_Click(object sender, EventArgs e)
    {
        d.Add(TextBox5.Text);
        d.Add(TextBox6.Text);
    }
    protected void Button3_Click1(object sender, EventArgs e)
    {
        foreach (string i in d)   //i am unable to get values of textboxes at button3 click.
        {
            Response.Write(i);   //how can i get.
        }
    }
}

Posted 16-Jun-13 18:08pm

naresh naik @ india

Updated 16-Jun-13 18:16pm

v2

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Sergey Alexandrovich Kryukov 17-Jun-13 0:23am

Please, don't re-post; this is considered as abuse. You should work on the page of your original question: add comments to answers, use "Improve question"...
—SA

3 solutions

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dhirajluhana · Answer 1 · 2013-06-16T19:21:00

Yes,
Amit is correct.

It is a basic thing in web Technology that between post back request, all the data will
be lost and the each request is considered as a new request.

So, each variable will be in it's original stag.

In this code , the variavle "List<string> d" is defined out side the all the methods,
so it will considered as a Golbal Variable for that page.

And to have the link with the older data for the variable before the post back ,

save the data in the viewstate or in Session is good idea.
If any one has another way , please post it here.

Thanks ..

From,
Dhiraj Luhana

_Amy · Answer 2 · 2013-06-16T18:19:00

Since, List<string> d is a global variable. Every variable defined in a class inheriting Web.UI.Page will be destroyed at the end of the Page-Lifecycle, hence it will be null in a Postback. You can store it in the Session or the ViewState.
Try like this:

C#

List<string> d= new List<string>();
protected void Button1_Click1(object sender, EventArgs e)
{
    d.Add(TextBox1.Text);
    d.Add(TextBox2.Text);
    d.Add(TextBox3.Text);
    d.Add(TextBox4.Text);
    ViewState["Value"] = d; //Store the value in viewstate
}
protected void Button2_Click(object sender, EventArgs e)
{
    d.Add(TextBox5.Text);
    d.Add(TextBox6.Text);
}
protected void Button3_Click1(object sender, EventArgs e)
{
    List<string> str = ViewState["Value"] as List<string>;
    foreach (string i in str)   //i am unable to get values of textboxes at button3 click.
    {
        Response.Write(i);   //how can i get.
    }
}

--Amit

naresh naik @ india · Answer 3 · 2013-06-16T19:19:00

C#

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
        List<string> d = new List<string>();
        d.Add(TextBox1.Text);
        d.Add(TextBox2.Text);
        d.Add(TextBox3.Text);
        d.Add(TextBox4.Text);
        ViewState["d"] = d;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        List<string> d;
        d = (List<string>)ViewState["d"];
        d.Add(TextBox5.Text);
        d.Add(TextBox6.Text);
    }
    protected void Button3_Click1(object sender, EventArgs e)
    {
        List<string> d;
        d = (List<string>)ViewState["d"];
        foreach (string i in d)
        {
            Response.Write(i);
        }
    }
}

very simple problem but i am unable resolve it.variable is unable to be shared among methods

3 solutions

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