webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="dynamicweb4_6.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h3>个人信息</h3>
        <table border="1" style="text-align:center;">
            <tr>
                <td>用户名:</td>
                <td>
                    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>密码:</td>
                <td>
                    <asp:TextBox ID="TextBox2" runat="server" TextMode="Password"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>再次输入密码:</td>
                <td>
                    <asp:TextBox ID="TextBox3" runat="server" TextMode="Password"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <asp:Button ID="Button1" runat="server" Text="注册" OnClick="Button1_Click" />
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <asp:Label ID="lblTips" runat="server" Text=""></asp:Label><br />
                    <asp:HyperLink ID="hlnkPI" runat="server" NavigateUrl="~/WebForm2.aspx" Visible="false">完善个人信息</asp:HyperLink>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>

webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace dynamicweb4_6
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (String.IsNullOrEmpty(TextBox1.Text))
            {
                lblTips.Text = "请输入用户名";
                lblTips.ForeColor = System.Drawing.Color.Red;
                TextBox1.Focus();
            }
            else if(String.IsNullOrEmpty(TextBox2.Text))
            {
                lblTips.Text = "请输入密码";
                lblTips.ForeColor = System.Drawing.Color.Red;
                TextBox2.Focus();
            }
            else if(String.IsNullOrEmpty(TextBox3.Text))
            {
                lblTips.Text = "请输入再次密码";
                lblTips.ForeColor = System.Drawing.Color.Red;
                TextBox3.Focus();
            }
            else if(TextBox2.Text != TextBox3.Text)
            {
                lblTips.Text = "两次输入密码不一致";
                lblTips.ForeColor = System.Drawing.Color.Red;
                TextBox2.Focus();
            }
            else
            {
                lblTips.Text = "注册成功!";
                hlnkPI.Visible = true;
            }
        }
    }
}

webform2.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="dynamicweb4_6.WebForm2" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h3>完善个人信息</h3>
    </div>
    </form>
</body>
</html>