when read value from one gridview to another using checkbox...that value should not pass into that checkbox value come false......

protected void btnget_Click(object sender, EventArgs e)
       {
           foreach (GridViewRow row in GridView1.Rows)
           {

               CheckBox ChkData = (CheckBox)row.FindControl("chkSelect");

               if (ChkData.Checked == true)
               {

                   string firstname = Convert.ToString(((Label)row.FindControl("labelfirstname")).Text);
                   string lastname = Convert.ToString(((Label)row.FindControl("labellastname")).Text);
                   string email = Convert.ToString(((Label)row.FindControl("email")).Text);
                   string reemail = Convert.ToString(((Label)row.FindControl("reemail")).Text);
                   string newpassword = Convert.ToString(((Label)row.FindControl("newpassword")).Text);
                   string birthday = Convert.ToString(((Label)row.FindControl("birthday")).Text);
                   string gender = Convert.ToString(((Label)row.FindControl("gender")).Text);




               }