client validation of user control without postback
<p>I have a page with two user controls inside two different ajax updatepanels. One control has textboxes and other control has a button. I have set same validation group to both user control's control's. When I hit the button, client validation fires but there is a potback after validation fires.</p>

<p>I have set validationgroup like this:</p>

<pre><code> public string ValidationGroup
        {
            get
            {
                return txtFirstName.ValidationGroup;
            }
            set
            {
                txtFirstName.ValidationGroup = value;
                txtLastName.ValidationGroup = value;
                txtPhoneNumber.ValidationGroup = value;
                txtEmail.ValidationGroup = value;
                txtFaxNumber.ValidationGroup = value;
                txtCompany.ValidationGroup = value;
                txtAddress1.ValidationGroup = value;
                txtAddress2.ValidationGroup = value;
                txtCity.ValidationGroup = value;
                txtZipPostalCode.ValidationGroup = value;
            }
        }

and here is how first control is user with validation group set to that property:

 &lt;nopCommerce:AddressEdit ID="ctrlBillingAddress" runat="server" IsNew="true" IsBillingAddress="true"
                        ValidationGroup="CheckoutConfirm" /&gt;

and here is how the control with button looks like:

 &lt;nopCommerce:CheckoutConfirm ID="ctrlCheckoutConfirm" runat="server" OnePageCheckout="true"
                                        OnCheckoutStepChanged="ctrlCheckoutConfirm_CheckoutStepChanged" /&gt;

where as markup for the button is like this:

 &lt;asp:LinkButton runat="server" ID="btnNextStep" 
                    OnClick="btnNextStep_Click" ValidationGroup="CheckoutConfirm" CausesValidation="true"&gt;&lt;img src="App_Themes/darkOrange/images/btnPlaceOrder.png" alt="Place Order" /&gt;&lt;/asp:LinkButton&gt;
</code></pre>

<p>Please suggest how to do client validation without postback ?</p>
