MVC :: UpdateModel In LINQ To SQL

I have been trying to develop edit functionality for a table in database using LINQ to SQL classes (.dbml). Thoiugh updatmodel does not fail, it still does not update the database. I have tried several different things with no resort. I have something going live in a day or so, Below is my code for controller class in MVC 1.1

//Homecontroller.cs
//Overload edit view for postback
[AcceptVerbs(HttpVerbs.Post)]
public object Edit(Guid id, FormCollection form)
{
//Get the row ID which is being edited
var Weballoc = db.WebAllocationImports.Single(w => w.OGReference == id);
try
{
// Weballoc.Side = Request.Form["Side"].ToString();
// Weballoc.Commission = Convert.ToDouble(Request.Form["Commission"]);
UpdateModel(Weballoc, new[] { "ClientSubAccount", "Quantity", "TradeDate", "SecurityID", "Side", "Commission", "NetAmount", "TradeID", "Price" });
db.SubmitChanges();
}
catch (Exception ex)
{
}
return View("ShowCGMAllocations",allocation);
The following is a sample of my edit.aspx view
<% using (Html.BeginForm()) {%>
<fieldset>
<legend>Fields</legend>
<p>
<label for="ClientSubAccount">ClientSubAccount:</label>
<%= Html.TextBox("ClientSubAccount", Model.ClientSubAccount) %>
<%= Html.ValidationMessage("ClientSubAccount", "*") %>
</p>
}
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
<% } %>