用戶登錄失敗「dbAdmin」

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我一直在各地谷歌和這個網站試圖建議解決我目前得到的錯誤：用戶登錄失敗「dbAdmin」

「無法打開連接用戶登錄失敗‘dbAdmin’

Connection：Data Source =。\ SQLEXPRESS; Initial Catalog = stantecUsers; User Id = dbAdmin; Password = 123456789;「

我創建一個登錄我MS SQL 2012 EXPRESS加入dbAdmin爲用戶：

而且我也確信該數據庫使用SQL Server和Windows身份驗證模式：

而對於我的WCF的Web服務，我有以下連接字符串：

try 
{ 
    string connetionString = @"Data Source=.\SQLEXPRESS;" + 
          "Initial Catalog=stantecUsers;" + 
          "User Id=dbAdmin;" + 
          "Password=123456789;"; 
    string sql = "SELECT * " + 
       "FROM [stantecUsers].[dbo].[users] AS stantecUsers " + 
       "INNER JOIN [stantecUsers].[dbo].[usersData] AS stantecUserData " + 
       "ON stantecUsers.link2Data = stantecUserData.link2Data " + 
       "WHERE stantecUsers.phoneNum = '" + phoneNum + "' " + 
       "ORDER BY stantecUsers.ID ASC;"; 
    SqlConnection connection; 
    SqlCommand command; 
    connection = new SqlConnection(connetionString); 

    // Create a new object that matches the structure of the JSON file. 
    var root = new RootObject 
    { 
     DATA = new DATA { clocked = new List<Clocked>() } 
    }; 

    try 
    { 
     connection.Open(); 
     command = new SqlCommand(sql, connection); 
     SqlDataReader read = command.ExecuteReader(); 

     while (read.Read()) 
     { 
     root.DATA.firstName = read["firstName"].ToString(); 
     root.DATA.lastName = read["lastName"].ToString(); 
     root.DATA.phoneNum = read["phoneNum"].ToString(); 
     root.DATA.title = read["title"].ToString(); 
     root.DATA.emailAddress = read["emailAddress"].ToString(); 
     root.DATA.image = read["image"].ToString(); 
     root.DATA.clocked.Add(new Clocked { 
       date = read["theDate"].ToString(), 
       type = read["theType"].ToString() 
     }); 
     } 

     read.Close(); 
     command.Dispose(); 
     connection.Close(); 

     return JsonConvert.SerializeObject(root, Formatting.Indented); 
    } 
    catch (Exception ex) 
    { 
     return "Can not open connection! " + ex.Message + " Connection: " + connetionString; 
    } 
} 
catch (SqlException e) 
{ 
    return e.Message; 
}

我不知道我需要從這裏去解決這個問題，它似乎不斷有這樣的幫助將是偉大的！

UPDATE：試圖在數據庫中添加用戶時：