<body>
<form id="form1" runat="server">
<div>
姓名：<asp:TextBox ID="txtUser" runat="server"></asp:TextBox>
<br />
<br />
性别：<asp:RadioButtonList ID="rblsex" runat="server">
<asp:ListItem>男</asp:ListItem>
<asp:ListItem>女</asp:ListItem>
</asp:RadioButtonList>
密码：<asp:TextBox ID="txtPwd" runat="server" TextMode="Password"></asp:TextBox>
<br />
移动电话：<asp:TextBox ID="txttel" runat="server"
ontextchanged="TextBox3_TextChanged"></asp:TextBox>
<br />
简介：<br />
<asp:TextBox ID="txtinfo" runat="server"></asp:TextBox>
<br />
<br />
<asp:ImageButton ID="ImageButton1" runat="server" Height="58px"
ImageUrl="~/img/QQ截图20130909140346.png" Width="72px" />
<br />
<br />
<br />
<br />
<br />
</div>
</form>
</body>
textChange的事件代码如下：
protected void txtNum2_TextChanged(object sender, EventArgs e) { if (txtNum2.Text.Length == 0) { //Page.RegisterClientScriptBlock("","<script>alert('请输入一个数');</script>"); Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "<script>alert('请输入一个数');</script>"); txtNum2.Focus(); } else { int result; bool n1 = Information.IsNumeric(txtNum2.Text.Trim()); if (n1) { result = int.Parse(txtNum2.Text.Trim()) % 2; if (result == 0) { txtSum.Text = "偶数"; } else { txtSum.Text = "奇数"; } } } } }