Web Forms :: Defaultaspx Does Not Contain A Definition For NextView And No Extension Method

I am using MultiView and View in .NET but i am getting this error: Compiler Error Message: CS1061: 'ASP.default_aspx' does not contain a definition for 'NextView' and no extension method 'NextView' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?)Source Error:

Line 24: THIS IS VIEW 1 . HAVE A LOOK ! iTS COOL BECAUSE OF C#.<br />
Line 25: <br />
Line 26: <asp:Button ID="Button1" runat="server" Text="nEXT" OnClick="NextView" /> Line 27: <br />
Line 28: <br />
Source File: c:UsersxxxxDocumentsVisual Studio 2012ProjectsWindowsAzure2TestCRoleDefault.aspx    Line: 26 

This is my aspx.cs code: using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System. Web.UI. WebControls;

namespace TestCRole{ public partial class _Default : Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { MultiView1.ActiveViewIndex = 0; } } void NextView(object sender, EventArgs e) { MultiView1.ActiveViewIndex += 1; } void PreView(object sender, EventArgs e) { MultiView1.ActiveViewIndex += 1; } protected void MultiView1_ActiveViewChanged(object sender, EventArgs e) {

} }}

And this is my aspx file:

<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent"> <p> <br /> <asp:MultiView ID="MultiView1" runat="server" OnActiveViewChanged="MultiView1_ActiveViewChanged"> <asp:View ID="View1" runat="server"> THIS IS VIEW 1 . HAVE A LOOK ! iTS COOL BECAUSE OF C#.<br /> <br /> <asp:Button ID="Button1" runat="server" Text="nEXT" OnClick="NextView" /> <br /> <br /> </asp:View> <asp:View ID="View2"

[code]...