ASP.NET登录注册页面实现

%@ 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> 

/// 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>"); 
 
   } 
  } 
 
   
 } 

/// 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>"); 
 }