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Create an extension method along the lines of:

public ValidationResults ValidateCollectionWith<T>(this IEnumerable<T> collection).CountGreaterThan( number).CountLessThanOrEqualTo(number).Unique();

this is more believable

public static CollectionValidator<T> BuildValidator<T>(this IEnumerable<T> collection);

and to get validation results use Validate() method:

List<T> collection;
ValidationResults results = collection.BuildValidator().CountGreaterThan(number).CountLessThanOrEqualTo( number).Unique().Validate();

this illustrates example of using validation of each object in collection:

List<T> collection;
var result = collection.BuildValidator().ElementValidation(x => x.NotNull().MaxLength(10).RegEx("^[0-9]")).Validate();