How to: Filter By DateTime Values
This example shows how to apply a filter to display orders created within a specific date range (between specific dates).
DateTime date1 = new DateTime(2011, 1, 1);
DateTime date2 = new DateTime(2011, 7, 1);
CriteriaOperator filter = GroupOperator.Combine(GroupOperatorType .And,
new BinaryOperator("OrderDate", date1, BinaryOperatorType.Greater),
new BinaryOperator("OrderDate", date2, BinaryOperatorType.Less));
ASPxGridView1.FilterExpression = filter.ToString();
Alternatively, you can use CriteriaOperator.Parse as shown below.