C# ENTER 防呆

<form id="form1" runat="server" onkeypress="if (window.event.keyCode==13) return false;">
..
.
.
.
</form>

C# 正規 紀錄

public static bool isMatchNumber(string str)
    {
        return Regex.IsMatch(str, @"(^([0-9]*|\d*\d{1}?\d*)$)");
    }