protected void btnSave_Click(object sender, EventArgs e)
        {
            if (Page.IsValid)
            {
                CustomerBAL obj = new CustomerBAL();
                obj.CustomerID = Convert.ToInt64(hdnCustomerID.Value);
                obj.FirstName  = txtFirstName.Text.Trim();
                obj.LastName   = txtLastName.Text.Trim();
                // obj.BirthDate = Convert.ToDateTime(txtBirthDate.Text.Trim());
                //obj.BirthDate = Convert.ToDateTime((txtBirthDate.Text).ToString());
                obj.BirthDate = DateTime.ParseExact(this.txtBirthDate.Text, "dd/MM/yyyy", null);
                obj.Email     = txtEmail.Text.Trim();
                obj.Address   = txtAddress.Text.Trim();

                int retVal = obj.InsertUpdateCustomer(obj);
                obj = null;
                if (retVal > 0)
                {
                    BindGrid();
                    ClearControls();
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "Saved", "<script>alert('Saved successfully.');</script>");
                }
                else
                {
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "Saved", "<script>alert('Error while saving.');</script>");
                }
            }
        }