为密码文本框要求不可粘帖字符串只可手动输入(附演示动画)

密码：asp:TextBox ID="TextBox1" runat="server" TextMode="Password">/asp:TextBox>可粘帖字符串。br />
密码：asp:TextBox ID="TextBox2" runat="server" TextMode="Password" onpaste = "return false;">/asp:TextBox>不可粘帖字符串。br />