ASP.NET登录注册页面实现

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如何利用Visual studio 2010创建一个ASP网站？
【文件】-->【新建】-->【网站】-->【ASP.Net网站】--【完成】

默认页面Default.aspx
创建以上界面：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UserLogin.aspx.cs" Inherits="UserLogin" %> 
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
 <title></title> 
</head> 
<body> 
 <div align="center"> 
 <h1>用户登录页面</h1> 
 <form id="form1" runat="server"> 
  <p> <asp:Label ID="lbusername" runat="server">用户名：</asp:Label> 
   <asp:TextBox ID="tbusername" runat="server"></asp:TextBox> 
   </p> 
 
  <p> <asp:Label ID="lbpsw" runat="server">密 码：</asp:Label> 
  <asp:TextBox ID="tbpsw" runat="server" TextMode="Password"></asp:TextBox> 
  </p> 
  <p><asp:Button ID="btnLogin" runat="server" Text="登录" onclick="btnLogin_Click" /> 
   <asp:Button ID="btnCancel" runat="server" Text="取消" onclick="btnCancel_Click" /> 
  </p> 
 </form> 
 </div> 
</body> 
</html>

登录验证功能

/// <summary> 
 /// 用户登录 
 /// </summary> 
 /// <param name="sender"></param> 
 /// <param name="e"></param> 
 protected void btnLogin_Click(object sender, EventArgs e) 
 { 
  if (tbusername.Text == "") 
  { 
   Response.Write(@"<script>alert('用户名不能为空！');</script>"); 
  } 
  if (tbpsw.Text == "") 
  { 
   Response.Write(@"<script>alert('密码不能为空！');</script>"); 
  } 
  string username = tbusername.Text; 
  string password = tbpsw.Text; 
  string sql = "select * from T_user where username=@username and password=@password"; 
  SqlParameter[] parameters = { new SqlParameter("@username",username), new SqlParameter("@password", password) }; 
  using (SqlConnection conn = new SqlConnection(connstr)) 
  { 
   conn.Open(); 
   using (SqlCommand cmd = conn.CreateCommand()) 
   { 
    cmd.CommandText = sql; 
    cmd.Parameters.AddRange(parameters); 
    DataSet ds = new DataSet(); 
    SqlDataAdapter adapter = new SqlDataAdapter(cmd); 
    adapter.Fill(ds); 
    DataTable table = ds.Tables[0]; 
    if(table != null) 
     Response.Write(@"<script>alert('登录成功！');</script>"); 
    else 
     Response.Write(@"<script>alert('登录失败！');</script>"); 
 
   } 
  } 
 
   
 }

注册功能

/// <summary> 
 /// 用户注册 
 /// </summary> 
 /// <param name="sender"></param> 
 /// <param name="e"></param> 
 protected void brnRegister_Click(object sender, EventArgs e) 
 { 
  string username = tbusername.Text; 
  string password = tbpsw.Text; 
  string sql = "Insert into T_user(username, password) values(@username,@password)"; 
  SqlParameter[] parameters = { new SqlParameter("@username", username), new SqlParameter("@password", password) }; 
  using (SqlConnection conn = new SqlConnection(connstr)) 
  { 
   conn.Open(); 
   using (SqlCommand cmd = conn.CreateCommand()) 
   { 
    cmd.CommandText = sql; 
    cmd.Parameters.AddRange(parameters); 
    cmd.ExecuteNonQuery(); 
   } 
  } 
 
  Response.Write(@"<script>alert('注册成功！');</script>"); 
 }

知识点归纳：
1.如何创建一个ASP.Net网站
2. 使用服务器控件实现界面设计
3. 对数据库的简单操作

一个简单的用户注册、登录就完成了，通过这个案例希望对大家的学习有所帮助。