private void SetAllNull()
{
this.OneCustomFilter = true;
this.vFirstOperator = FilterOperatorValues.Equal;
this.HasFirstOperator = false;
this.FirstVal = string.Empty;
this.vSecondOperator = FilterOperatorValues.Equal;
this.HasSecondOperator = false;
this.SecondVal = string.Empty;
this.And = null;
}
