asp 连接数据库的语句

            #region 连接数据库
            
            SqlConnection conn = new SqlConnection();
            //conn.ConnectionString = "server=127.0.0.1\\sqlexpress;uid=sa;pwd=0;database=EXTDatabase";
            conn.ConnectionString = ConfigurationManager.ConnectionStrings["stringcon"].ConnectionString;
            if (conn.State == ConnectionState.Closed)
                conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = string.Format(" select * from login where USERID = '{0}' and PASSWORD = '{1}'", UserName, Password);
            //object obj = cmd.ExecuteScalar();
            
            SqlDataReader reader = cmd.ExecuteReader();
            
            if (reader.Read())
            {

                
                Session["rolevalue"] = reader["RoleValue"].ToString();
                Session["username"] = reader["USERID"].ToString();
                string struser=Session["username"].ToString();

                if (Session["username"] != "" && Session["username"] != null)
                    Response.Write("{success:true}");
                else
                    Response.Write("{success:false}");
            }
            else
            {
                Response.Write("{success:false}");
            }
            if (conn.State != ConnectionState.Closed)
                conn.Close();
            #endregion

            #region 连接数据库
            
            SqlConnection conn = new SqlConnection();
            //conn.ConnectionString = "server=127.0.0.1\\sqlexpress;uid=sa;[email protected];database=EXTDatabase";
            conn.ConnectionString = ConfigurationManager.ConnectionStrings["stringcon"].ConnectionString;
            if (conn.State == ConnectionState.Closed)
                conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = string.Format(" select * from login where USERID = '{0}' and PASSWORD = '{1}'", UserName, Password);
            //object obj = cmd.ExecuteScalar();
            
            SqlDataReader reader = cmd.ExecuteReader();
            
            if (reader.Read())
            {

                
                Session["rolevalue"] = reader["RoleValue"].ToString();
                Session["username"] = reader["USERID"].ToString();
                string struser=Session["username"].ToString();

                if (Session["username"] != "" && Session["username"] != null)
                    Response.Write("{success:true}");
                else
                    Response.Write("{success:false}");
            }
            else
            {
                Response.Write("{success:false}");
            }
            if (conn.State != ConnectionState.Closed)
                conn.Close();
            #endregion