How to navigate to another tab in ajax tabcontainer control using button

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C#

Hi!
I have used ajax tabcontainer controller. It has 3 tabs. I want to go to next tab when the button on the first tab is clicked. Following is my code in Registration.aspx page.

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">


    <asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server"></asp:ScriptManagerProxy>
 
             
    <cc1:TabContainer ID="TabContainer1"   runat="server" Visible="true" AutoPostBack="true">
        <cc1:TabPanel  runat="server" ID="Company">
            <HeaderTemplate>Commpany Details</HeaderTemplate>
           <ContentTemplate>
               <%--  <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                     <ContentTemplate>--%>
               <table>
                   <tr>
                       <td>
                           <asp:Label ID="lblCompanyName" runat="server" Text="Company Name"></asp:Label>
                       </td>
                       <td>
                           <asp:TextBox ID="txtCompnyName" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                   <tr>
                       <td>
                           <asp:Label ID="lblUserName" runat="server" Text="User Name"></asp:Label>
                       </td>
                       <td>
                           <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                   <tr>
                       <td>
                            <asp:Label ID="lblpwd" runat="server" Text="Password"></asp:Label>
                       </td>
                       <td>
                            <asp:TextBox ID="txtpwd" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                       <tr>
                       <td>
                            <asp:Label ID="lblConfirmPwd" runat="server" Text="Confirm Password"></asp:Label>
                       </td>
                       <td>
                            <asp:TextBox ID="txtconfirmPwd" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                       <tr>
                       <td>
                            <asp:Label ID="lblAdmin" runat="server" Text="Name Of the Admin"></asp:Label>
                       </td>
                       <td>
                            <asp:TextBox ID="txtAdmin" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                       <tr>
                       <td>
                            <asp:Label ID="lblContact" runat="server" Text="Contact"></asp:Label>
                       </td>
                       <td>
                            <asp:TextBox ID="txtContact" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                       <tr>
                       <td>
                            <asp:Label ID="lblEmail" runat="server" Text="E-mail"></asp:Label>
                       </td>
                       <td>
                            <asp:TextBox ID="txtEmmail" runat="server"></asp:TextBox>
                       </td>
                   </tr>
                     <%-- </ContentTemplate>
                   </asp:UpdatePanel>--%>
                   <tr>
                       <td>
                           <asp:Button runat="server" ID="btnNext1"  Text="Next" OnClick="btnNext1_Click"/>
                       </td>

                   </tr>
               </table>
                      
           </ContentTemplate>
        </cc1:TabPanel>
       
         <cc1:TabPanel  runat="server" ID="tabProducts">
            <HeaderTemplate>Products</HeaderTemplate>
           <ContentTemplate>This is content 2</ContentTemplate>
        </cc1:TabPanel>
         <cc1:TabPanel  runat="server" ID="tabReportss" >
            <HeaderTemplate>Reports Info</HeaderTemplate>
            <ContentTemplate>This is content 3</ContentTemplate>
        </cc1:TabPanel>
    </cc1:TabContainer>

    </asp:Content>

Following is the code of code behind file.

namespace OnlineReportSystem.Admin
{
    public partial class AdminRagistration : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnNext1_Click(object sender, EventArgs e)
        {
           // Response.Write(TabContainer1.ActiveTabIndex.ToString());
            TabContainer1.ActiveTab = TabContainer1.Tabs[TabContainer1.ActiveTabIndex++];
        }
    }
}

When I click on the next button, Page is refreshed without any changes. Suggest me the solution. Also tell me whether my approach is right or wrong.