Exec() error : ExecuteNonQuery requires an open and available Connection. The connection's current state is closed.   at Activa.DB.DBClient.ExecInternal(Object obj, DBParameterList parameterList)
   at Activa.DB.DBClient.Exec(String sqlQuery, Object[] p)
   at Activa.WebMagic.PageHandler.ProcessRequest(HttpContext httpContext)
ExecuteNonQuery requires an open and available Connection. The connection's current state is closed.   at System.Data.SqlClient.SqlConnection.GetOpenConnection(String method)
   at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)
   at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Activa.DB.DBClient.ExecInternal(Object obj, DBParameterList parameterList)