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I'm trying to allow a user to enter data into a textbox that will be added to the web.config file. I've added the relevent lines to the web.config file but when I make this class all goes wrong. I keep getting the are you missing a using directive or assembly refenrence error whenever I try to run my app. I have looked at the other times this question has been asked and can't seem to figure out where I'm going wrong. The thing is that I am extremely new to Visual Studio and am just left blank at what could be the answer. Below here is the class file that's generating the error. I hope I've included everything you need to assist me. Thank you. using System.Collections.Generic; using System.Linq; using System.Configuration; namespace WebConfigDemo { public class CompanyConfigSection : ConfigurationSection { [ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)] public CompanyConfigCollection Companies { get { return (CompanyConfigCollection)this[""]; } set { this[""] = value; } } } public class CompanyConfigElement : ConfigurationElement { [ConfigurationProperty("id", IsKey = true, IsRequired = true)] public int Id { get { return (int)this["id"]; } set { this["id"] = value; } } [ConfigurationProperty("name", IsRequired = true)] public string Name { get { return this["nam

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