ASP.NET:Required Field Validator not working - asp.net

Question

I've got a weird problem that i don't understand why it happened.
I made a content page so a user can send me a message to my email and made a few TextBox's that are linked to some validators.
when i first made the page i hed 1 Regular Expression validator and every thing worked out fine like i planed it, But then i decided to delete the Regular Expression validator and now i got a problem with the Required Field validator.
when i press submit the page do a post back like there isn't any validators on the page.
I'm pretty sure I'm missing something (I'm pretty new at asp.net)
here is the markup:
<!-- Regular Expression Validtor for the Name Text Box
<asp:RegularExpressionValidator ID="NameExpressionValidator1" runat="server" ControlToValidate="nameTextBox"
ValidationExpression="[אבגדהוזחטיכלמנסעפצקרשתץףןם\s\.]*" Display="Dynamic"> </asp:RegularExpressionValidator> -->
<!--The Name Text Box -->
<asp:TextBox ID="nameTextBox" class="TextBoxes" runat="server"
AutoPostBack="True" ValidationGroup="g" ></asp:TextBox> <span class="infoText">:שם</span>
<!-- Required Field Validator for the Name Text Box -->
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="nameTextBox"
Display="Dynamic" ValidationGroup="g" ErrorMessage="please enter your name"></asp:RequiredFieldValidator>
<br />
<br />
<!-- Phone Text Box -->
<asp:TextBox ID="phoneTestBox" class="TextBoxes" runat="server"
AutoPostBack="True" ValidationGroup="g" ></asp:TextBox> <span class="infoText">:טלפון</span>
<!-- Requierd Field Validator Phone Text Box -->
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="phoneTestBox"
Display="Dynamic" ValidationGroup="g" ErrorMessage="please enter your phone"></asp:RequiredFieldValidator>
<br />
<br />
<asp:TextBox ID="messagTextBox" runat="server" class="TextBoxes" TextMode="MultiLine"
Text="asdasdadasdasdasd"></asp:TextBox> <span class="infoText">:הודעה</span>
<asp:Button ID="button" runat="server" Text="send message" ValidationGroup="g" />

Answer 1

You should not use HTML comments to comment out server side controls but <%-- --%>:
<%--
<asp:RegularExpressionValidator ID="NameExpressionValidator1" runat="server" ControlToValidate="nameTextBox"
ValidationExpression="[אבגדהוזחטיכלמנסעפצקרשתץףןם\s\.]*" Display="Dynamic"> </asp:RegularExpressionValidator>
--%>
http://msdn.microsoft.com/en-us/library/4acf8afk.aspx

Answer 2

Is there any specific use of AutoPostBack="True" in textbox? if not then just remove it from all textboxes, also you need to give ValidationGroup="g" for only validator controls, there is no need to give it in textbox controls.

Answer 3

first of all, ensure the validation group of the validation summary matches?
If that's correct try using validation method:
protected void Page_Load(object sender, EventArgs e)
{
Validate();
}