You can manually trigger client-side validation for ASP.NET Web Forms Server side controls. One way of doing it explained here.
ASP.NET Web Forms
3 posts tagged with “ASP.NET Web Forms”
Hunting security bugs in an old web applicationOctober 09, 2017 · 4 min read
In this post, I am sharing one of my security bug hunting experience in an older ASP.NET web form project.