>>Viv,
>>
>>For the single value it worked.
>>
>>However, I discovered that this code didn't work correctly:
>>
>>

>> matrixTemplateViewModel.AllPossibleValues = _matrixTemplateValuesAdapter.GetAll().Select(v => new ValueAttribute
>>            {
>>                ValueName = v.ValueName,
>>                AttributeId = v.AtnameId,
>>                Hidden = v.Hidden
>>            }).Distinct().OrderBy(x=>x.AttributeId).ThenBy(y=>y.ValueName).ToList();

>>
>>The list I got back contained all rows form the templates table, not just distinct values by these 3 columns.
>>
>>Do you see what may be wrong here?
>>
>>I also tried
>>
>>

>>var allValues = _matrixTemplateValuesAdapter.GetAll().Select(v => new ValueAttribute
>>            {
>>                ValueName = v.ValueName,
>>                AttributeId = v.AtnameId,
>>                Hidden = v.Hidden
>>            }).OrderBy(x=>x.AttributeId).ThenBy(y=>y.ValueName).ToList();
>>
>>            matrixTemplateViewModel.AllPossibleValues = allValues.Distinct().ToList();

>>
>>but still got 192 values in both lists. I am supposed to get only 95 in the second list after selecting only distinct values.
>>
>>Thanks in advance.
>
>Distinct uses the default equality comparer which, for an object, will be reference equality. You will need to implement the IEquatable interface on the ValueAttribute class so that Distinct will look for value equality

Thanks, it sounded a bit complex, so I just used the direct SQL command instead, e.g.

public List<ValueAttribute> GetAllPosibleValues()
        {
            List<ValueAttribute> result = _siriusContext.CoreContext.ExecuteStoreQuery<ValueAttribute>
               (@";with cte as (select t.value_name as ValueName, t.atname_id as AttributeId, t.hidden as Hidden, t.tmpnam_id as TemplateId,
t.tmpl_order as SortOrder,  

row_number() over (partition by t.atname_id, t.value_name order by t.tmpnam_id,

t.tmpl_order) as Rn from dbo.i_tmplat t)

select ValueName, AttributeId, Hidden
from cte 
where Rn = 1
ORDER BY AttributeId, TemplateId, SortOrder").ToList();
            return result;
        }

since I found that just SELECT DISTINCT didn't return exactly what I wanted in the right order.