ASP.NET的用户登录

private   void   btnSignIn_Click(object   sender,   System.Web.UI.ImageClickEventArgs   e)  
  {  
  try  
  {  
  //   检查用户身份！  
  //   获取登陆IP  
  string   clientIP   =   Request.ServerVariables["REMOTE_ADDR"];  
  UserManager   um   =   new   UserManager();  
   
  //   对密码进行MD5加密  
  Byte[]   dateToHash   =   ConvertStringToByteArray(txtUserPassword.Text.Trim());  
  byte[]   hashvalue1   =   ((HashAlgorithm)   CryptoConfig.CreateFromName("MD5")).ComputeHash(dateToHash);  
  string   userPassword   =   BitConverter.ToString(hashvalue1).Trim();  
   
  //   登陆认证  
  int   i   =   um.LogonAuthenticate(txtLogonName.Text.Trim(),userPassword,clientIP);  
  switch(i)  
  {  
  case   1:  
  //   成功登陆  
  FormsAuthentication.RedirectFromLoginPage(txtLogonName.Text.Trim(),chkAutoSignIn.Checked);  
  //FormsAuthentication.RedirectFromLoginPage(Server.UrlEncode(txtLogonName.Text.Trim()),chkAutoSignIn.Checked);  
   
   
  //FormsAuthentication.GetRedirectUrl(txtLogonName.Text,false);  
  //FormsAuthentication.SetAuthCookie(txtLogonName.Text.Trim(),chkAutoSignIn.Checked,@"http://ylh/SSO_Portal");  
  //string   return_url   =   FormsAuthentication.GetRedirectUrl(txtLogonName.Text,chkAutoSignIn.Checked);  
  //Response.Write("<script>history.back();</script>");  
  break;  
   
  case   0:  
  //   帐号冻结  
  Response.Write("<script>alert('由于您的帐号被管理员冻结，您将无法登陆系统！请与管理员联系！');</script>");  
  break;  
   
  default:  
  //   非法登陆  
  Response.Write("<script>alert('您不是本系统的合法用户，此次登陆属非法登陆！');</script>");  
  break;  
  }  
  }  
  catch  
  {  
  Response.Write("<script>alert('登陆失败！请稍后再试！');</script>");  
  }  
  }  

 

 

protected   void   LoginBtn_Click(object   sender,   EventArgs   e)  
  {  
  if   (Page.IsValid)    
  {  
             
  //连接数据库  
  string   strConn="server=Localhost;uid=sa;pwd=;database=eFrum";  
  //   连接到eForum数据库  
  SqlConnection   cn=new   SqlConnection(strConn);  
  //   打开连接  
  cn.Open();  
  //   构造SQL语句，该语句在RegUsers表中检查昵称和密码是否正确  
  String   strSQL="select   *   from   regusers   where   nickname='"+  
  nickname.Text+"'   and   password='"+pwd.Text+"'";  
  //   创建Command对象  
          SqlCommand   cm=new   SqlCommand(strSQL,cn);  
  //   执行ExecuteReader()方法      
  SqlDataReader   dr=cm.ExecuteReader();  
  if   (dr.Read())    
  {  
  Message1.Text="";  
  //   保存当前用户的昵称  
  Session["username"]=dr["nickname"];  
  Session["upower"]=dr["upower"];  
  //   进入主画面  
  Response.Redirect("index.aspx");  
  }    
  else    
  {  
  Message1.Text="昵称/密码不对,请重新登录或<a   href=adduser.aspx>注册</a>";  
  }  
  //   关闭连接  
  cn.Close();  
  }  
  }  
   
  }

 

 

private   void   button1_Click(object   sender,   System.EventArgs   e)  
  {  
                                              try  
  {  
  this.Cursor=Cursors.Default;  
  this.sqlDataAdapter1.SelectCommand   =   this.sqlSelectCommand1;  
  this.sqlSelectCommand1.CommandText   =   "SELECT   cbmdh,   cbmmc,   cpassword   FROM   getuser   WHERE   (cbmmc   =   @cbmmc)";  
  this.sqlSelectCommand1.Connection   =   this.sqlConnection1;  
  this.sqlSelectCommand1.Parameters.Add(new   System.Data.SqlClient.SqlParameter("@cbmmc",   System.Data.SqlDbType.VarChar,   10,   "cbmmc"));  
  this.sqlSelectCommand1.Parameters["@cbmmc"].Value=this.flatTextBox1.Text.ToString();  
  this.sqlDataAdapter1.Fill(this.dataSet11);  
  if(this.flatTextBox1.Text!="")  
  {  
  if(this.dataSet11.Tables["getuser"].Rows.Count>0)  
  {  
  try  
  {  
  this.dataSet11.Tables["getuser"].Rows.Clear();  
  this.sqlDataAdapter2.SelectCommand   =   this.sqlSelectCommand2;  
  this.sqlSelectCommand2.CommandText   =   "SELECT   cbmdh,   cbmmc,   cpassword   FROM   getuser   WHERE   (cbmmc   =   @cbmmc)   AND   (cpassword   =   @cpassword)";  
  this.sqlSelectCommand2.Connection   =   this.sqlConnection1;  
  this.sqlSelectCommand2.Parameters.Add(new   System.Data.SqlClient.SqlParameter("@cbmmc",   System.Data.SqlDbType.VarChar,   10,   "cbmmc"));  
  this.sqlSelectCommand2.Parameters.Add(new   System.Data.SqlClient.SqlParameter("@cpassword",   System.Data.SqlDbType.VarChar,   10,   "cpassword"));  
  this.sqlSelectCommand2.Parameters["@cbmmc"].Value=this.flatTextBox1.Text.ToString();  
  this.sqlSelectCommand2.Parameters["@cpassword"].Value=this.flatTextBox2.Text.ToString();  
  this.sqlDataAdapter2.Fill(this.dataSet11);  
   
  if(this.dataSet11.Tables["getuser"].Rows.Count==1)  
  {  
  Mainform   mf=new   Mainform();  
  mf.Show();  
  this.Visible=false;  
  this.Dispose(false);  
  }  
  else  
  {  
  MessageBox.Show("密码错误，请重新填写！");  
  }  
   
  }  
  catch(Exception   ex)  
  {  
  MessageBox.Show(ex.Message,   "错误",   MessageBoxButtons.OK,   MessageBoxIcon.Error);  
  }  
   
  }  
  else  
  {  
  MessageBox.Show("该用户不存在，请重新登录！");  
  this.flatTextBox3.Focus();  
  this.flatTextBox3.Cursor=Cursors.Default;  
  }  
  }  
  else  
  {  
  MessageBox.Show("用户名不能为空！");  
  }  
  }  
  catch(Exception   ex)  
  {  
  MessageBox.Show(ex.Message,   "错误",   MessageBoxButtons.OK,   MessageBoxIcon.Error);  
  }  
  finally  
  {  
  this.dataSet11.Dispose();  
  this.sqlDataAdapter1.Dispose();  
  this.sqlDataAdapter2.Dispose();  
  }  
   
  }