InfoPath Dev

In my form i add drop down list box i bind the list to this drop down list in this list contains large no of data so i want to filter the drop down. So i add one text box before the drop down. I want to filter the drop down value based on text box enter text it work but issue is that If i enter Xyz then drop filter show only Xyz filter result but not showing the xyz. I means case sensitive issue. I filter the drop using the contains filter to check is textbox value is in drop down.

 Unfortunately, the only way around case sensitivity is to use the translate function in your filter - so you'd compare translate(field1, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz') to the other field - and translate that as well.

Thanks Hilary it work.