简单项目

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

/// <summary>
/// Nation 的摘要说明
/// </summary>
public class Nation
{
    public Nation()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public string NationName { get; set; }
    public string NationCode { get; set; }

}using System;

using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
/// <summary>
/// UsersData 的摘要说明
/// </summary>
public class UsersData
{
    SqlConnection conn = null;
    SqlCommand cmd = null;
    public UsersData()
    {
        conn = new SqlConnection("server=.;database=Data0425;user=sa;pwd=123;");
        cmd = conn.CreateCommand();
    }
    /// <summary>
    /// 查询此用户是否存在，存在就返回true
    /// </summary>
    /// <param name="uname">用户名</param>
    /// <param name="upass">密码</param>
    /// <returns></returns>
    public bool SelectUser(string uname, string upass)
    {
        bool has = false;
        cmd.CommandText = "select *from Users where UserName=@a and PassWord=@b";
        cmd.Parameters.Clear();
        cmd.Parameters.Add("@a", uname);
        cmd.Parameters.Add("@b", upass);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.HasRows)
        {
            has = true;
        }
        conn.Close();
        return has;
    }
    /// <summary>
    /// 查询全部的Users表信息
    /// </summary>
    /// <returns></returns>
    public List<Users> SelectAll()
    {
        List<Users> list = new List<Users>();
        cmd.CommandText = "select *from Users";
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.HasRows)
        {
            while (dr.Read())
            {
                Users u = new Users();
                u.UserName = dr[0].ToString();
                u.PassWord = dr[1].ToString();
                u.NickName = dr[2].ToString();
                u.Sex = Convert.ToBoolean(dr[3]);
                u.Birthday = Convert.ToDateTime(dr[4]);
                u.Nation = dr[5].ToString();
                list.Add(u);
            }
        }
        conn.Close();
        return list;
    }
    public bool Delete(string name)
    {
        bool isok = false;
        cmd.CommandText = "delete from Users where username='" + name + "'";
        try
        {
            conn.Open();
            cmd.ExecuteNonQuery();
            isok = true;
        }
        catch { }
        finally { conn.Close(); }
        return isok;
    }
    public Users SelectUser(string name)
    {
        Users u = new Users();
        cmd.CommandText = "select *from Users where username=@a";
        cmd.Parameters.Clear();
        cmd.Parameters.Add("@a", name);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.HasRows)
        {
            dr.Read();
            u.UserName = dr[0].ToString();
            u.PassWord = dr[1].ToString();
            u.NickName = dr[2].ToString();
            u.Sex = Convert.ToBoolean(dr[3]);
            u.Birthday = Convert.ToDateTime(dr[4]);
            u.Nation = dr[5].ToString();
        }
        conn.Close();
        return u;
    }
    public bool UpdateUser(Users uuu)
    {
        bool isok = false;
        cmd.CommandText = "update users set password=@a,nickname=@b,sex=@c,birthday=@d,nation=@e where username=@aaaa";
        cmd.Parameters.Clear();
        cmd.Parameters.Add("@a", uuu.PassWord);
        cmd.Parameters.Add("@b", uuu.NickName);
        cmd.Parameters.Add("@c", uuu.Sex);
        cmd.Parameters.Add("@d", uuu.Birthday);
        cmd.Parameters.Add("@e", uuu.Nation);
        cmd.Parameters.Add("@aaaa", uuu.UserName);
        try
        {
            conn.Open();
            cmd.ExecuteNonQuery();
            isok = true;
        }
        catch { }
        finally
        {
            conn.Close();
        }
        return isok;
    }
}

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

/// <summary>
/// Nation 的摘要说明
/// </summary>
public class Nation
{
    public Nation()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public string NationName { get; set; }
    public string NationCode { get; set; }

}

================================================================================================================================================

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
/// <summary>
/// Users 的摘要说明
/// </summary>
public class Users
{
    SqlConnection conn = null;
    SqlCommand cmd = null;
    public Users()
    {
        conn = new SqlConnection("server=.;database=Data0425;user=sa;pwd=123;");
        cmd = conn.CreateCommand();
    }
    public string UserName { get; set; }
    public string PassWord { get; set; }
    public string NickName { get; set; }
    public bool Sex { get; set; }
    public DateTime Birthday { get; set; }
    public string Nation { get; set; }
    public string SexStr {
        get {
            return Sex ? "男" : "女";
        }
    }
    public string NationName {
        get {
            string end = "<无>";
            cmd.CommandText = "select *from Nation where NationCode=@a";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@a", Nation);
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                end = dr["NationName"].ToString();
            }
            conn.Close();
            return end;
        }
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default1.aspx.cs" Inherits="Default1" %>

<!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>
    <style type="text/css">
        #tb1 {
            background-color: navy;
             100%;
            text-align: center;
        }

        #tr_head {
            font-size: 18px;
            font-family: 微软雅黑;
            color: white;
        }

            #tr_head td {
                padding: 10px;
            }

        .item {
            background-color: white;
        }

            .item td {
                padding: 10px;
            }

        .alt_item {
            background-color: #e0e0e0;
        }

            .alt_item td {
                padding: 10px;
            }
    </style>
</head>
<body>
    <form id="form1" runat="server">
        <h1>这是主界面</h1>
        <asp:Repeater ID="Repeater1" runat="server">
            <HeaderTemplate>
                <table id="tb1">
                    <tr id="tr_head">
                        <td>用户名</td>
                        <td>密码</td>
                        <td>昵称</td>
                        <td>性别</td>
                        <td>生日</td>
                        <td>民族</td>
                        <td>操作</td>
                    </tr>
            </HeaderTemplate>
            <AlternatingItemTemplate>
                <tr class="alt_item">
                    <td><%#Eval("UserName") %></td>
                    <td><%#Eval("PassWord") %></td>
                    <td><%#Eval("NickName") %></td>
                    <td><%#Eval("SexStr") %></td>
                    <td><%#Eval("Birthday","{0:yyyy年MM月dd日}") %></td>
                    <td><%#Eval("NationName") %></td>
                    <td><a href="UpdatePage.aspx?aaa=<%#Eval("UserName") %>" target="_blank">修改</a>&nbsp;<a href="DeletePage.aspx?aaa=<%#Eval("UserName") %>">删除</a></td>
                </tr>
            </AlternatingItemTemplate>
            <ItemTemplate>
                <tr class="item">
                    <td><%#Eval("UserName") %></td>
                    <td><%#Eval("PassWord") %></td>
                    <td><%#Eval("NickName") %></td>
                    <td><%#Eval("SexStr") %></td>
                    <td><%#Eval("Birthday","{0:yyyy年MM月dd日}") %></td>
                    <td><%#Eval("NationName") %></td>
                    <td><a href="UpdatePage.aspx?aaa=<%#Eval("UserName") %>" target="_blank">修改</a>&nbsp;<a href="DeletePage.aspx?aaa=<%#Eval("UserName") %>">删除</a></td>
                </tr>
            </ItemTemplate>

            <FooterTemplate>
                </table>
            </FooterTemplate>
        </asp:Repeater>
    </form>
</body>
</html>

=================================================================================================================================================

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

public partial class Default1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["ok"] != null)
        {
            bool okok = Convert.ToBoolean(Session["ok"]);
            if (okok)
            {
                Response.Write("<script>alert('删除成功');</script>");
            }
            else
            {
                Response.Write("<script>alert('删除失败');</script>");
            }
            Session["ok"] = null;
        }

        Bind();
    }

    public void Bind()
    {
        Repeater1.DataSource = new UsersData().SelectAll();
        Repeater1.DataBind();
    }

}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DeletePage.aspx.cs" Inherits="DeletePage" %>

<!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>
    
    </div>
    </form>
</body>
</html>

================================================================================================================================================

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

public partial class DeletePage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string Name = Request["aaa"];
        bool ok=false;
        if (!String.IsNullOrEmpty(Name))
        {
            ok = new UsersData().Delete(Name);
        }

        Session["ok"] = ok;

        Response.Redirect("Default1.aspx");
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UpdatePage.aspx.cs" Inherits="UpdatePage" %>

<!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>
        <h1>用户修改</h1>
        用户名：<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /><br />
        新密码：<asp:TextBox ID="TextBox1" TextMode="Password" runat="server"></asp:TextBox><br /><br />
        昵称：<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br /><br />
        性别：<asp:RadioButtonList ID="RadioButtonList1" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow">
            <asp:ListItem Value="true">男</asp:ListItem>
            <asp:ListItem Value="false">女</asp:ListItem>
           </asp:RadioButtonList><br /><br />
        生日：<asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>年<asp:DropDownList ID="DropDownList2" runat="server"></asp:DropDownList>月<asp:DropDownList ID="DropDownList3" runat="server"></asp:DropDownList>日<br /><br />
        民族：<asp:DropDownList ID="DropDownList4" runat="server"></asp:DropDownList><br /><br />
        <asp:Button ID="Button1" runat="server" Text="确认修改" />
        <asp:Button ID="Button2" runat="server" Text="关闭" />
    </div>
    </form>
</body>
</html>

================================================================================================================================================

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

public partial class UpdatePage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;

        //1、接收传过来的主键值
        string Name = Request["aaa"];

        //2、通过主键值将对象查出来
        Users u = new UsersData().SelectUser(Name);

        //3、绑定控件的数据
        if (IsPostBack == false)
        {
            BindDropDown();
            BindDropDown1();

            //4、将控件的默认值更改为对象的值
            Label1.Text = u.UserName;//绑定用户名
            TextBox2.Text = u.NickName;//绑定昵称

            if (u.Sex)//绑定性别
            {
                RadioButtonList1.SelectedIndex = 0;
            }
            else
            {
                RadioButtonList1.SelectedIndex = 1;
            }

            //绑定生日
            DropDownList1.SelectedValue = u.Birthday.Year.ToString();
            DropDownList2.SelectedValue = u.Birthday.Month.ToString();
            DropDownList3.SelectedValue = u.Birthday.Day.ToString();
            //绑定民族
            DropDownList4.SelectedValue = u.Nation;
        }
    }

    void Button1_Click(object sender, EventArgs e)
    {
        Users uu = new Users();
        uu.UserName = Label1.Text;
        uu.PassWord = TextBox1.Text;
        uu.NickName = TextBox2.Text.Trim();
        uu.Sex = RadioButtonList1.Items[0].Selected;
        uu.Birthday = Convert.ToDateTime(DropDownList1.Text + "-" + DropDownList2.Text + "-" + DropDownList3.Text);
        uu.Nation = DropDownList4.SelectedItem.Value;
        bool okok = new UsersData().UpdateUser(uu);
    }

    public void BindDropDown()
    {
        for (int i = 1900; i <= DateTime.Now.Year; i++)
        {
            ListItem li = new ListItem(i.ToString(), i.ToString());
            DropDownList1.Items.Add(li);
        }

        for (int i = 1; i <= 12; i++)
        {
            ListItem li = new ListItem(i.ToString(), i.ToString());
            DropDownList2.Items.Add(li);
        }

        for (int i = 1; i <= 31; i++)
        {
            ListItem li = new ListItem(i.ToString(), i.ToString());
            DropDownList3.Items.Add(li);
        }
    }

    public void BindDropDown1()
    {
        DropDownList4.DataSource = new NationData().SelectAll();
        DropDownList4.DataTextField = "NationName";
        DropDownList4.DataValueField = "NationCode";
        DropDownList4.DataBind();
    }

}