protected void btnsubmit_Click(object sender, EventArgs e)
    {
        BALLogin objloginbal = new BALLogin();
        DALLogin objlogindal = new DALLogin();

        objloginbal.UserName = Session["username"].ToString();
        objloginbal.Password = txtoldpassword.Text;

        DataSet ds = new DataSet();
        ds=objlogindal.ValidateLogin(objloginbal);

        if(ds.Tables[0].Rows.Count>0)
        {
            objloginbal.LoginId = Convert.ToInt32(ds.Tables[0].Rows[0][0].ToString());
            objloginbal.Password = txtnewpassword.Text;
            objlogindal.ChangePassword(objloginbal);

            Response.Write("<script>alert('Password Changed');</script>");
        }
        else
        {
            Response.Write("<script>alert('Invalid Login Details');</script>");
        
        }
    }