unable to retain the values for dynamic creation of grid rows after print

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C#

ASP.NET

i have a gridview in which i have created dynamic rows in row created event as shown in below code.when i print the grid the print dialog opens and after closing the dialog the dynamically generated columns of grid disappers and the grid gets messed up coz i m not able to retain the values for Date.How can i achieve the task.Help me.

protected void grdPBook_RowDataBound(object sender, GridViewRowEventArgs e)
{
   if (e.Row.RowType == DataControlRowType.DataRow)
   {
      strPreviousRowID = DataBinder.Eval(e.Row.Date).ToString()}
      grdPBook.ShowFooter = false;
   }
}

protected void grdPBook_RowCreated(object sender, GridViewRowEventArgs e)
{
   bool IsSubTotalRowNeedToAdd = false;
   bool IsGrandTotalRowNeedtoAdd = false;
   if (ddlSummary.SelectedValue == "0")
   {
      if ((strPreviousRowID != string.Empty)(DataBinder.Eval(e.Row.DataItem,Date) != null))
      {
         if (strPreviousRowID != DataBinder.Eval(e.Row.DataItem, Date).ToString())
         {
            if (ddlSummary.SelectedValue == "0")
            {
               IsSubTotalRowNeedToAdd = true;
            }
         }
      }
      if (IsSubTotalRowNeedToAdd)
      {
         // ---code for adding dynamic subtotal row-----
      }
   }
}