System.Exception: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: TCP Provider, error: 0 - 由于连接方在一段时间后没有正确答复或连接的主机没有反应,连接尝试失败。) at Tuan.DBUtility.DbHelperSQL.GetSingle(String connectionString, String SQLString) in E:\WebDocument\tuan\Tuangou_v4\Tuan\Tuan.DBUtility\DbHelperSQL.cs:line 215 at Tuan.DBUtility.DB.GetSingle(String strsql) in E:\WebDocument\tuan\Tuangou_v4\Tuan\Tuan.DBUtility\DB.cs:line 189 at Tuan.BLL.KeyValueBLL.GetValue(Int32 ClassID, Int32 CityID) in E:\Tuangou_v4\Tuan\Tuan.BLL\KeyValueBLL.cs:line 58 at Control_V20110101_header.Page_Load(Object sender, EventArgs e) in e:\web\tuan.web\Control\header.ascx.cs:line 30
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