How to display data in griddviwe after login in child page display grid viwe data in Parent page

Hi friends,
 I have one parent page where i have one grideviwe bind with value 
i want to display that gridviwe only when user login into child page
 once user login into child page after closing login childpage 
& data should be display in gridviwe of Paren page How to doths 
plz help  me

Thanks

my .aspx code

 

 
 
 
 
 
 
 
 
 
 
    //i have doubt here becouse i call return false statment after js functin how i bind data with gridviwe
 
 
 
 
 
 
 
 
 
 

Select Query   SELECT   INSERT   UPDATE

 

aspx.cs code

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class queryeditor : System.Web.UI.Page
{
  clientinfo objclient = new clientinfo();
  public string pageredirect;
  protected void Page_Load(object sender, EventArgs e)
  {
  if (!IsPostBack)
  {
  string ID = Request.QueryString["0"];
  txtqueryexec.Text = "";

  }
 
 
  }
  protected void btnexec_Click(object sender, EventArgs e)
  {
  FillGrid();
 
 
 

  }
  private void FillGrid()
  {
 
  DataSet ds = objclient.get_queryexec(drpdwn_query.SelectedItem.Text, txtqueryexec.Text);
  if (ds.Tables[0].Rows.Count > 0)
  {
  gv_command.Visible = true;
  gv_command.DataSource = ds;
  gv_command.DataBind();
  }
 
  }
  protected void drpdwn_query_SelectedIndexChanged(object sender, EventArgs e)
  {
 
  string query = drpdwn_query.SelectedItem.Text;
  switch(query)
  {
  case "SELECT":
  txtqueryexec.Text = "SELECT * FROM  [TABLENAME]";
  break;

  case "INSERT":
  txtqueryexec.Text = "INSERT INTO  [TABLENAME]  [(col1, col2, col3,...colN)]  VALUES  (value1, value2, value3,...valueN)";
  break;

  case "UPDATE":
  txtqueryexec.Text = "UPDATE  [TABLENAME]  SET column_1 = [value1], column_2 = [value2]";
  break;
  }
  }
}