ASP.NET Enter key - asp.net

Question

I have a master page and based on that master page I created a page with a TextBox and two Validation controls for RequiredValidator and RegularExpressionValidator and one ValidationSummary.
when pressing the enter key in TextBox, I expected that both validator show their errorMessage on validationSummary but thats not what happening it only works when I press the button on page.
According to this page I wrapped my code with <asp:panel> and a DefaultButton attribute but it didn't solve the problem.
http://www.codeproject.com/KB/aspnet/aspnet_Enter_key_problem.aspx
I want to know what the problem here is and whether there is any workaround?
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">
**<asp:Panel runat="server" DefaultButton="EmailSend">**
<table style="width: 100%">
<tr>
<asp:ValidationSummary ID="EmailValidation" runat="server" CssClass="failureNotification"
ValidationGroup="EmailValidation" />
</tr>
<tr>
<td style="width: 76px">
Email:
</td>
<td class="style1">
<asp:TextBox ID="EmailForget" runat="server" Width="244px"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="EmailRequiered" runat="server" ControlToValidate="EmailForget"
CssClass="failureNotification" ErrorMessage="RequiredFieldValidator" ValidationGroup="EmailValidation">*</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="EmailRegular" runat="server" ControlToValidate="EmailForget"
CssClass="failureNotification" ErrorMessage="email required"
ValidationGroup="EmailValidation">*</asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td style="width: 76px">
</td>
<td class="style1">
<asp:Button ID="EmailSend" runat="server" Text="send" Width="56px" ClientIDMode="Static" />
</td>
<td>
</td>
</tr>
</table>
**<asp:Panel>**
</asp:Content>

Answer 1

Try adding this code
<script type="text/javascript">
if (document.addEventListener) {//if Firefox
document.addEventListener("keypress", fireFoxHandler, true);
} else {
document.attachEvent("onkeyup", ieHandler);
}
function fireFoxHandler(evt) {
if (evt.keyCode == 13) {
document.getElementById("EmailSend").click();
}
}
function ieHandler(evt) {
if (evt.keyCode == 13) {
document.getElementById("EmailSend").click();
}
}
</script>
Found this solution here.
(I didn't check this in MasterPage scenario, please check...)

Answer 2

If you are using IE then according to the answers on these two pages:
ASP.NET enter key and form submit with no javascript
Enter button does not submit form (IE ONLY) ASP.NET
you only need to add the following to your form
<!-- Fix for IE bug submit on pressing "Enter") -->
<div style="display:none">
<input type="text" name="hiddenText"/>
</div>

Answer 3

I solved this problem like this:
protected void Page_Load(object sender, EventArgs e)
{
textboxusername.Attributes.Add("onKeyPress", "javascript:if (event.keyCode == 13) __doPostBack('" + LinkButton1.UniqueID + "','')");
textboxpassword.Attributes.Add("onKeyPress", "javascript:if (event.keyCode == 13) __doPostBack('" + LinkButton1.UniqueID + "','')");
}
and this is the link..
<asp:LinkButton ID="LinkButton1" runat="server" class="btn" OnClick="LinkButton1_Click">