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Wednesday, September 5, 2012

Storing Object in ViewState Example

In this Example i am using ViewState and HashTable to store value of textbox.

HashTable class is a serializable, it can be stored in view state without a hitch.

All the control information for the page are store in hashtable and then add the hashtable to the viewstate for the page.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
public partial class viewstate : System.Web.UI.Page
{
    Hashtable texttosave = new Hashtable();
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnadd_Click(object sender, EventArgs e)
    {
        savealltext(form1.Controls,true);
        ViewState["controltext"] = texttosave;
    }
    private void savealltext(ControlCollection controls,bool savenested)
    {
        foreach (Control control in controls)
        {
            if (control is TextBox)
            {
                texttosave.Add(control.ID, ((TextBox)control).Text);
            }
            if ((control.Controls != null) && savenested)
            {
                savealltext(control.Controls, true);
            }
        }
    }
    protected void btndisplay_Click(object sender, EventArgs e)
    {
        if (ViewState["controltext"] != null)
        {
            Hashtable savedtext = (Hashtable)ViewState["controltext"];
            Label1.Text = "";
            foreach (DictionaryEntry item in savedtext)
            { 
            Label1.Text += (string)item.Key+"="+(string)item.Value+"<br/>";
            }
        }
    }
}
output

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