ASP.NET TextBox 只能key數字 和 hidden

只能輸入數字與小數點
<asp:TextBox ID="txt_1" runat="server" onKeypress="return BlockNumber(event);"></asp:TextBox>
function BlockNumber(e)
{
    var key = window.event ? e.keyCode : e.which;
    var keychar = String.fromCharCode(key);
    reg = /[0-9]|\./;
    return reg.test(keychar);
}


只能輸入數字
view sourceprint
<asp:TextBox ID="tb1" runat="server" onKeypress="if(event.keyCode < 48 || event.keyCode > 57) { event.returnValue = false; }">
</asp:TextBox>

只能輸入數字與Enter鍵
<asp:TextBox ID="tb2" runat="server" onKeypress="if(event.keyCode < 48 || event.keyCode > 57) if(event.keyCode != 13 ){ event.returnValue = false; }">
</asp:TextBox>

hidden
myTextBox.Style.Add("visibility", "hidden");
// or :
myTextBox.Style.Add("display", "none");

 <asp:TextBox ID="txtdate" runat="server" Style="display:none;Width:110"
                    ></asp:TextBox>