AJAX Recaptcha,Use Recaptcha with EXT.Net ,Use Recaptcha with EXT JS,Validate Recaptcha C#

C# code

        protected void btnCreateAccount_Click(object sender,DirectEventArgs  e)

        {

            recaptcha.Validate();

            bool result = recaptcha.IsValid;

            if (result)

            {

                X.Msg.Alert("Done", "Given text is correct").Show();           

                X.Js.Call("javascript:Recaptcha.reload()");

              

            }

            else

            {

                X.Msg.Alert("Error", "Given text is incorrect").Show();

            }

        }

_____________________________________________________________________

ASP Code

<ext:Window

            ID="winSignUp"

            runat="server"

            Closable="false"

            Resizable="false"

            Height="400"

            Icon="Lock"

            Title="Sign Up"

            Draggable="false"

            Width="350"

            Modal="true"

            BodyPadding="5"

            Layout="AnchorLayout"

            Hidden="true">

            <Items>

                <ext:TextField

                    ID="txtUserNameSignUp"

                    runat="server"                     

                    FieldLabel="User Name"

                    AllowBlank="false"

                    AnchorHorizontal="100%"

                    />

                <ext:TextField

                    ID="txtPasswordSignUp"

                    runat="server"

                    InputType="Password"

                    FieldLabel="Password"

                    AllowBlank="false"

                    AnchorHorizontal="100%"

                    />

                <ext:TextField

                    ID="txtRePassword"

                    runat="server"   

                    InputType="Password"                 

                    FieldLabel="Re Password"

                    AllowBlank="false"

                    AnchorHorizontal="100%"

                    />

                <ext:TextField

                    ID="txtEmailId"

                    runat="server"                    

                    FieldLabel="Email Id"

                    AllowBlank="false"

                    AnchorHorizontal="100%"

                    />

            </Items>

            <Content>

           

            <recaptcha:RecaptchaControl

    ID="recaptcha"

    runat="server"

    PublicKey="your public key"

    PrivateKey="your private key"

    />

            </Content>

              

            <Buttons>

                <ext:Button ID="btnCreateAccount" runat="server" Text="CreateAccount" Icon="Accept" >                 

                    <DirectEvents>

                        <Click OnEvent="btnCreateAccount_Click">

                            <EventMask ShowMask="true" Msg="Sign Up..." MinDelay="500" />

                        </Click>

                    </DirectEvents>

                </ext:Button>

            </Buttons>

        </ext:Window>

____________________________________