JQuery:preventDefault() method will do.

e.preventDefault() is the key method, to disable the default operations to proceed further. We first stop the event from further bubbling up to other parent controls and put any custom logic.

@"e" is a event.


Example:
$('#<%=textbox.ClientID%>').bind('cut copy paste',
function (e) {
e.preventDefault();
alert("Cut / Copy / Paste are not allowed.");

});

MVC: set Default value in Html.TextboxFor Helper In Asp.Net MVC 2

Html.TextBoxFor in MVC 2 doesn't allow the setting of the value property using the object html attributes.
syntax - 
<%= Html.TextBoxFor(model => model.city, new { maxlength = "40" })%>

If you need to set a default value on a textbox field, you need to use the old 

syntax - 
<%= Html.TextBox("city", "New Delhi", new { maxlength = "40" })%>