Validation is not working with user input controls

Question

I used validation on my aspx page, but it doesn't work and there is no error

<div class="fourm-container">                         
    <div class="single-input">
        <span>email</span>
        <input name="" type="text" runat="server" id="email" />
        <asp:RequiredFieldValidator ID="RVemail" runat="server"
            ErrorMessage="*" ControlToValidate="email" Display="Dynamic"
            ForeColor="Red" SetFocusOnError="True" 
            ValidationGroup="one"></asp:RequiredFieldValidator>
    </div>
    <div class="button-container">
        <input type="submit" id="Submit" value="login" name="submit" 
            onclick="AddCustomer" runat="server" validationgroup="one" />
    </div>

Answer 1

with the form tag and the closing div, I tried this snippet and could see the validation happening. (without the onclick) if you see it working, then the onclick has an issue.

<form id="form1" runat="server">
    <div class="fourm-container">
        <div class="single-input">
            <span>email</span>
            <input name="" type="text" runat="server" id="email" />
            <asp:RequiredFieldValidator ID="RVemail" runat="server"
                ErrorMessage="*" ControlToValidate="email" Display="Dynamic"
                ForeColor="Red" SetFocusOnError="True"
                ValidationGroup="one"></asp:RequiredFieldValidator>
        </div>
        <div class="button-container">
            <input type="submit" id="Submit" value="login" name="submit" runat="server" validationgroup="one" />
        </div>
    </div>
</form>

Answer 2

You can't use ValidationGroup="one" in RequiredFieldValidator .

Try it:

<asp:RequiredFieldValidator ID="RVemail" runat="server"
                ErrorMessage="*" ControlToValidate="email" Display="Dynamic"
                ForeColor="Red" SetFocusOnError="True">
</asp:RequiredFieldValidator>