I'm trying to learn some C# & asp, while creating a booking page in Visual Studio. I have faced a little problem with the RequiredFieldValidator, because when i click the button, nothing happens.

I'm using the bootstrap css files to make in a little more shiny. Some code of the registrationpage is here:

Updated code

<asp:Content ID="RegistrationContent" ContentPlaceHolderID="MainContent" runat="server">

<br />
<div class="container">
    <h2>Registration</h2>
    <p>Please fill out the forms to complete your registration.</p>
    <form role="form">
        <div class="form-group">
            <label for="username">Name:</label>
            <asp:TextBox runat="server" ID="UserName" CssClass="form-control" />
            <asp:RequiredFieldValidator runat="server" ControlToValidate="UserName"
                CssClass="text-danger" ErrorMessage="The user name field is required." ID="RequiredFieldValidator1" ValidationGroup="Registration" />
        </div>
        <div class="form-group">
            <label for="email">Email:</label>
            <asp:TextBox runat="server" ID="Email" CssClass="form-control" />
            <asp:RequiredFieldValidator runat="server" ControlToValidate="Email"
                CssClass="text-danger" ErrorMessage="The email field is required." ID="RequiredFieldValidator2" ValidationGroup="Registration" />
        </div>
        <div class="form-group">
            <label for="password">Password:</label>
            <asp:TextBox runat="server" ID="Password" CssClass="form-control" TextMode="Password" />
            <asp:RequiredFieldValidator runat="server" ControlToValidate="Password"
                CssClass="text-danger" ErrorMessage="An password is required." ID="RequiredFieldValidator3" ValidationGroup="Registration" />
        </div>
        <div class="form-group">
            <label for="confirmpassword">Confirm Password:</label>
            <asp:TextBox runat="server" ID="ConfirmPassword" CssClass="form-control" ValidationGroup="Registration" TextMode="Password" />
            <asp:RequiredFieldValidator runat="server" ControlToValidate="ConfirmPassword"
                CssClass="text-danger" ErrorMessage="An password is required." ID="RequiredFieldValidator4" ValidationGroup="Registration" />
        </div>
        <div class="form-group">
            <button type="button" ValidationGroup="Registration" class="btn btn-primary btn-sm">Create</button>
            &nbsp;
            <button type="reset" ValidationGroup="Registration" class="btn btn-primary btn-sm">Reset</button>
        </div>
    </form>
</div>

Have made the validationgroup, but it still does not work.. any other suggestions?