list getting the null values even there are values in table

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C#

Hi,
I have a method inside the repository, when i am calling that method in the wcfservice it returns the list as null but when i am running the query it is running well but in service method it returns a null list... i dont know where the problem is ..

my code is like this:

in repository the method is :
public List<BUILD_INFO> GetChartInfo(string lineNo, string shiftDateTime, string station)
{
string query = string.Format("SELECT SUM(QTY_BUILD) AS BUILD_QTY, SUM(QTY_FAIL) AS FAIL_QTY, "+
"DATEPART(HH,BUILD_HOUR) AS SHIFT_HOURS FROM BUILD_INFOWITH (NOLOCK) "+
"WHERE LINE_NO='{0}' AND BUILD_HOUR >='{1}' AND STATION='{2}' "+
"GROUP BY DATEPART(HH,BUILD_HOUR) ORDER BY SHIFT_HOURS ",_tableName, lineNo, shiftDateTime, station);

return MYRepository.Fetch<BUILD_INFO>(query);
}
i am calling this method in the service as follows:

var buildInfo=new BuildInfoRepository();
var build=buildInfo.GetChartInfo(lineNo,datetime,station);

in build i am getting null only..

thanks in advance..

kpr.