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How to aggregate a collection of items in one cell of an ASPxGridView
IQueryable<TaskEntity> taskQuery;

taskQuery = TaskQueryStore.GetTasks(...);

var query = from task in taskQuery
            select new
                   {
                       task.Id,
                       task.TaskName,
                       OrgList = ???
                   }

e.KeyExpression = "Id";
e.QueryableSource = query;

OrgList = task.OrganizationCollection.Aggregate("", (acc, item) => (acc == "" ? "" : acc + "<br>") + item.OrgName)

OrgList = String.Join("<br>", task.OrganizationCollection.Select(x => x.OrgName).ToArray())

OrgList = GetOrgList(task.Id)