System.InvalidOperationException: ConnectionString 属性尚未初始化，该怎么解决？？？

Question

源错误：
行 22:         SqlConnection Con = new SqlConnection(ConfigurationManager.AppSettings["ConSql"]);
行 23: 
行 24:         Con.Open();
行 25:         SqlCommand Com = new SqlCommand(cmdtxt, Con);
行 26:         SqlDataReader dr = Com.ExecuteReader();堆栈跟踪:
[InvalidOperationException: ConnectionString 属性尚未初始化。]
   System.Data.SqlClient.SqlConnection.PermissionDemand() +46
   System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection) +22
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +89
   System.Data.SqlClient.SqlConnection.Open() +160
   message.Page_Load(Object sender, EventArgs e) in d:\百特\baite\message.aspx.cs:24
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +13
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +45
   System.Web.UI.Control.OnLoad(EventArgs e) +80
   System.Web.UI.Control.LoadRecursive() +49
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3750
代码：
    protected void Page_Load(object sender, EventArgs e)
    {
        string cmdtxt = "SELECT * FROM tb_LeaveWord";        SqlConnection Con = new SqlConnection(ConfigurationManager.AppSettings["ConSql"]);        Con.Open();
        SqlCommand Com = new SqlCommand(cmdtxt, Con);
        SqlDataReader dr = Com.ExecuteReader();
        dr.Read();
        if (dr.HasRows)
        {
            uno = dr["Uno"].ToString();
            DateTime = dr["DateTime"].ToString();
            Subject = dr["Subject"].ToString();
            Content = dr["Content"].ToString();
            Reply = dr["Reply"].ToString();
        }
        dr.Close();
        this.dlBind();
    }请请请帮忙解决下！

Answer 1

检查一下WEB.CONFIG里的字符串是否正确，建议使用：
<connectionStrings> 
<add name="SqlServices" connectionString="server=.;database=数据库名称;uid=用户名;pwd=密码" providerName="System.Data.SqlClient" /> 
</connectionStrings>

Answer 2

我照这样改了，还是不行，你看看是不是有哪改还不对？<configuration>
<appSettings>
<add key="ConnectionString" value="server=WWW-901A5024DA8;database=baite;UId=hh;password=hh"/>
<!--定义连接-->
</appSettings>
  <connectionStrings>
    <add name="SqlServices" connectionString="server=.;database=baite;uid=hh;pwd=hh" providerName="System.Data.SqlClient" />
  </connectionStrings>

Answer 3

 string ConnStr = ConfigurationManager.AppSettings["DBConnectionSql"].ToString();
<appSettings>
<add key="DBConnectionSql" value="server=(local);User ID=sa;Password=sa;database=master;Connection Reset=FALSE"/>
</appSettings>
到51aspx.com上很多实例