登录次数验证，可能还是有些不足的，希望大家指正

 protected void BtnLogin_Click(object sender, EventArgs e)
        {
            string ConStr = ConfigurationManager.ConnectionStrings["ConStr"].ToString();
            string GetNameSql = "SELECT [Title] FROM [dbo].[Info] WHERE [Title]=‘" + this.TxtName.Text+"‘";
            string GetPwdSql = "SELECT [Details] FROM [dbo].[Info] WHERE [Details]=‘" + this.Txtpwd.Text + "‘";

            string Name = string.Empty;
            string Pwd = string.Empty;
            using(SqlConnection conn=new SqlConnection(ConStr))
            {
                conn.Open();
                SqlCommand Pwdcomm = new SqlCommand(GetPwdSql, conn);
                Pwd = Convert.ToString(Pwdcomm.ExecuteScalar());
                SqlCommand Namecomm = new SqlCommand(GetNameSql,conn);
                Name = Convert.ToString(Namecomm.ExecuteScalar());
               

                if (Name == this.TxtName.Text && Pwd == this.Txtpwd.Text)
                {
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert(‘登陆成功！‘);</script>");
                }
                else 
                {
                    Response.Write("<script>alert(‘登陆失败！‘);</script>");
                    //Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert(‘登陆失败！‘);</script>");
                }

                if ((Name == this.TxtName.Text && Pwd != this.Txtpwd.Text) || (Name != this.TxtName.Text && Pwd == this.Txtpwd.Text))
                {
                    Session["count"] = Convert.ToInt32(Session["count"]) + 1;
                }
                if (Convert.ToInt32(Session["count"]) > 3)
                {
                    string UpdateTime = "SELECT Datediff(minute, [LoginDate], GetDate()) FROM [Info] WHERE Title=‘" + this.TxtName.Text+"‘";
                    SqlCommand comm = new SqlCommand(UpdateTime,conn);
                    string countMiuntes=(30-Convert.ToInt32(comm.ExecuteScalar())).ToString();
                    if (Convert.ToInt32(countMiuntes) > 0)
                    {
                        Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert(‘登陆超过三次失败！距离解禁还有" + countMiuntes + "分钟‘);</script>");
                    }
                    if (Convert.ToInt32(countMiuntes) <= 0)
                    {
                        string GetNowTime = "UPDATE [Info] SET [LoginDate]=‘" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + "‘ WHERE Title=‘" + this.TxtName.Text + "‘";
                        SqlCommand commtime = new SqlCommand(GetNowTime, conn);
                        if (commtime.ExecuteNonQuery() > 0)
                        {
                            Session.RemoveAll();
                        }
                    }
                }
            }
        }