CRM 2011 – QueryExpressions where a field is null

I had to write some code today which retrieved some entities which didn’t have a value in a field, so basically I had to write a query to find all the entities which had a null value.

I finally found some sample code on the Microsoft SDK

FilterExpression null_filter = new FilterExpression(LogicalOperator.And);
null_filter.FilterOperator = LogicalOperator.And;
null_filter.AddCondition("leadid", ConditionOperator.Null);

below is my full code.  I am selecting my custom charges entity where the invoice lookup value is null

public IEnumerable<meta_charge> getCharges(IOrganizationService service)

ConditionExpression condition1 = new ConditionExpression();

condition1.AttributeName = "new_invoice";
condition1.Operator = ConditionOperator.Null;
FilterExpression filter1 = new FilterExpression();

QueryExpression query = new QueryExpression(new_charge.EntityLogicalName);
query.ColumnSet = new ColumnSet(true);


EntityCollection result1 = service.RetrieveMultiple(query);

IEnumerable<new_charge> charges = result1.Entities.Cast<new_charge>();
return charges;

catch (Exception)
// You can handle an exception here or pass it back to the calling method.
return null;


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