How to store one column values in viewstate and retrieve one by one

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Dear friend I am jitendra kumar working on an Web based ERP Application

I want to store multiple values of an column in viewstate and retrive one by one in string type variable to send from one page to another page.

C#

using System;
    using System.Collections;
    using System.Configuration;
    using System.Data;
    using System.Linq;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.HtmlControls;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Xml.Linq;
    using System.Data.SqlClient;
    using System.Text.RegularExpressions;
    using System.Collections.Generic;

    namespace egurkul
    {
     [Serializable]
     public class field
     {
        public int class_Id { get; set; }
        public string adm_no { get; set; }
     }
    public partial class Searchstudentresult : System.Web.UI.Page
    {
    string adm_no = "";
    List<field> data = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            data = new List<field>();
        }
       protected void btnprint_Click(object sender, EventArgs e)
         {
           printall();
           string adm_no= ViewState["_data"].ToString();
           int class_id= ViewState["_data"].ToString();
           Response.Redirect("examreportcard.aspx?adm_no=" + adm_no +  "&class_id=" + class_id + "");

        }

         public void printall()
          {
           foreach (GridViewRow g1 in gvstudentDetails.Rows)
            {
               field f1 = new field();

               f1.adm_no=Convert.ToString((g1.FindControl("lbladm_no")  as Label).Text);

               f1.Class_Id=Convert.ToInt32(ddlclass.SelectedValue);
           }
             data.Add(f1);
             ViewState["_data"] = data;

        }


    }

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Posted 3-Feb-16 21:00pm

jitendra raj

Updated 3-Feb-16 21:49pm

Manas_Kumar

v2

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Comments

Kornfeld Eliyahu Peter 4-Feb-16 4:03am

1. Adding data to the viewstate is not a good idea, unless you need to preserve that data via postbacks (and can't do it on the server). The size of the viewstate means more network to both direction...
2. In any case viewstate not preserved between pages, so can't use to pass data between
3. It would be nice to share with us, what are you try to achieve and someone may come up with a better suggestion...

F-ES Sitecore 4-Feb-16 4:28am

Use the Session instead of ViewState.

jitendra raj 4-Feb-16 4:31am

how we do that

F-ES Sitecore 4-Feb-16 7:29am

https://msdn.microsoft.com/en-us/library/ms178581.aspx

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Manas_Kumar · Answer 1 · 2016-02-03T22:38:00

View State is the method to preserve the Value of the Page and Controls between round trips. It is a Page-Level State Management technique.

View State is turned on by default and normally serializes the data in every control on the page regardless of whether it is actually used during a post-back. For example, you can store information in view state that will be accessed during the page load event the next time the page is sent to the server.

Step1: Declare a class with Serializable attribute

C#

[Serializable]
 public class field
 {
	public int class_Id { get; set; }
	public string adm_no { get; set; }
 }

Step2: Store data in Viewstate

C#

List<field> data = new List<field>();
// Storing it in Viewstate
foreach (GridViewRow g1 in gvstudentDetails.Rows)
{
	field f1 = new field();

	f1.adm_no=Convert.ToString((g1.FindControl("lbladm_no")  as Label).Text);

	f1.Class_Id=Convert.ToInt32(ddlclass.SelectedValue);
}

data.Add(f1);
ViewState["_data"] = data;

Step3: Retrieve data from viewstate

C#

// get value from viewstate
if (ViewState["_data"] != null)
{
  List<field> fieldList = (List<field>)ViewState["_data"];
  
  // Implement your logic
}

Note: You are storing list object in Viewstate, it may create performance overhead of the page. Secondly in your code it is redirect to some other page, means you won't the Viewstate value in other page.