1. Add “validaterequest =” false “to the header of the page where HTML needs to be submitted
<%@ Page Language="C#" AutoEventWireup="true" ValidateRequest="false" %>
2. Webconfig’s< system.web >Configuration under node
The above article Asp.net Webform setting allows the form to submit HTML method is to edit all the content shared with you, I hope to give you a reference, also hope you can support developeppaer.