命名空间“System.Data”中不存在类型或命名空间名称“SqlServerCe”System.Data.SqlServer...

命名空间“System.Data”中不存在类型或命名空间名称“SqlServerCe” SqlCeConnection sqlceConn = new SqlCeConnection("server=.;database=db_Stream;uid=sa;pwd="); sqlceConn.Open(); SqlCeCommand sqlceCmd = new SqlCeCommand(sqlStr, sqlceConn); SqlCeDataReader sqlDr = sqlceCmd.ExecuteReader(); sqlDr.Read();