DataTable中读取的字段为空时的判断

DataTable中读取的字段为空时的判断

DataTable dt       =   new DataTable();
dt                 =   DataAccess.DataAccess.ExecuteDataTable(CommandType.StoredProcedure,Sql,obj);
if(Convert.IsDBNull(dt.Rows[0]["NumCount"]))
...{
returnvalue    =   0;
}