Tutorial by Topics: xss

Overview Cross-Site Scripting, commonly referred to as XSS, is a type of web application injection attack in which malicious scripts are injected into trusted websites. XSS attacks occur when an attacker takes advantage of, or "exploits," a flaw in a web application to send the attack...

Data validation allows user to create a drop-down list and restrict values in the cell to these entries. Due to limitation Excel can't bind more than 256 characters programmatically. To bind more than 256 characters one can follow explained approach.

Creating the data validation constraint can be tricky and time taking in NPOI. I have shared some of my workable approach. These approach will give good idea to customize your own constraint types.