Composite filter descriptor to find records that match two different columns.

[John]

I'm trying to create filter that works on two columns.  The first column "IsActive" = true works properly. 
I need to have a second filter on a column that filters for all "ParticipantId" that is a nullable integer type
 thatis either null or empty.
Logical this would be an And
Currently this is what I have but it does not work.  How would I includea filter for a null integer column using AND logic?
var filterDescriptors = new List<IFilterDescriptor>
            {
                new CompositeFilterDescriptor{
                    FilterDescriptors =
                    [
                        new FilterDescriptor{
                            Member = "IsActive",
                            Operator = FilterOperator.IsEqualTo,
                            Value = true,
                            MemberType = typeof(bool)
                        },
                         new FilterDescriptor{
                            Member = "ParticipantId",
                            Operator = FilterOperator.IsNullOrEmpty,
                            Value = null,
                            MemberType = typeof(int)
                        }                       
                    ]
                }
            };
 

[Dimo]

Hello John,

There are a few things to fix in the code:

1. There must be a separate CompositeFilterDescriptor for each column.
2. IsNullOrEmpty is not a valid operator for int?. Use IsNull instead.
3. It's better to use nameof() instead of hard-coded strings for the Member property.

https://blazorrepl.telerik.com/coEMbSbR38wk1Rsb34

Regards,
Dimo
Progress Telerik