how to use viewstate in class library in a web application in 3 tier architect?

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I have created one application with one default page in which i added a project 2 class library (Business layer,all logics are here),(data aceess layer sql connection).Now wat i did i took three textboxes for adding values thrice and simplying added in datatable with 3 rows filled.now i took viewstate so that value should be retained of previous .this work is achieved on ui code but here now i added one class " queries .cs" in class library (business layer)..i took datatable in cal.cs ..but here i am not able to use viewstate .i know viewstate is page control .how to make it use in class library .

C#

namespace BusinessLayer
{
    public class queries 
    {
        DataTable dt;
        DataRow dr;
       public void createDataTable()
        {
            dt = new DataTable();



            dt.Columns.Add(new DataColumn("Sr.No", typeof(int)));
            dt.Columns.Add(new DataColumn("Product ID", typeof(int)));
            dt.Columns.Add(new DataColumn("Product Name", typeof(string)));
            dt.Columns.Add(new DataColumn("Price", typeof(int)));
            dt.Columns.Add(new DataColumn("Quantity", typeof(int)));
            dt.Columns.Add(new DataColumn("Subtotal", typeof(int)));
            dt.Columns["Sr.No"].AutoIncrement = true;
            dt.Columns["Sr.No"].AutoIncrementSeed = 1;
            dt.Columns["Sr.No"].AutoIncrementStep = 1;
            ViewState["dt"] = dt;

        }

error viewstate does not exist in current context

Posted 12-Feb-13 23:03pm

shivani 2013

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Asim Mahmood · Answer 1 · 2013-02-12T23:38:00

Hi
try this

Hi,

Try this

namespace BusinessLayer
{
    public class queries 
    {
        DataTable dt;
        DataRow dr;
       public void createDataTable()
        {
            dt = new DataTable();
 

 
            dt.Columns.Add(new DataColumn("Sr.No", typeof(int)));
            dt.Columns.Add(new DataColumn("Product ID", typeof(int)));
            dt.Columns.Add(new DataColumn("Product Name", typeof(string)));
            dt.Columns.Add(new DataColumn("Price", typeof(int)));
            dt.Columns.Add(new DataColumn("Quantity", typeof(int)));
            dt.Columns.Add(new DataColumn("Subtotal", typeof(int)));
            dt.Columns["Sr.No"].AutoIncrement = true;
            dt.Columns["Sr.No"].AutoIncrementSeed = 1;
            dt.Columns["Sr.No"].AutoIncrementStep = 1;
            ViewBag["dt"] = dt;
 
        }