Myujth

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["name"].ToString(); 
 
 set 
 
 this["name"] = value; 
 

 
 ' 
public class CompanyConfigCollection : ConfigurationElementCollection 
 
 protected override ConfigurationElement CreateNewElement() 
 
 return new CompanyConfigElement(); 
 
 protected override object GetElementKey(ConfigurationElement element) 
 
 return ((CompanyConfigElement)element).Id; 
 
 
public class CompaniesConfig 
 
 private static readonly Dictionary<int, CompanyConfigElement> 
 Elements; 
 static CompaniesConfig() 
 
 Elements = new Dictionary<int, CompanyConfigElement>(); 
 var section = (CompanyConfigSection)ConfigurationManager.GetSection ("companies"); 
 foreach (CompanyConfigElement system in section.Companies) 
 Elements.Add(system.Id, system); 
 
 public static CompanyConfigElement GetCompany(int companyId) 
 
 return Elements[companyId]; 
 
 public static List<CompanyConfigElement> Companies 
 
 get
 
 return Elements.Values.ToList(); 
 
 

 '

Any help is appreciated

You probably don't have the System.Configuration dll added to the project references. It is not there by default, and you have to add it manually.

Right-click on the References and search for System.Configuration in the .net assemblies.

Check to see if it is in your references...

Right-click and select Add Reference...

Find System.Configuration in the list of .Net Assemblies, select it, and click Ok...

The assembly should now appear in your references...

.Net framework of the referencing dll should be same as the .Net framework version of the Project in which dll is referred

You using statements appear correct.

Are you perhaps missing the assembly reference to System.configuration.dll?

Right click the "References" folder in your project and click on "Add Reference..."

This problem would be caused by your application missing a reference to an external dll that you are trying to use code from. Usually Visual Studio should give you an idea about which objects that it doesn't know what to do with so that should be a step in the right direction.

You need to look in the solution explorer and right click on project references and then go to add -> and look up the one you need. It's most likely the System.Configuration assembly as most people have pointed out here while should be under the Framework option in the references window. That should resolve your issue.

I have observed a quote ' in your 1st line and also at the end of your last line.

'using System.Collections.Generic;

Is this present in your original code or some formatting mistake?

I had the same problem earlier today. I could not figure out why the class file I was trying to reference was not being seen by the compiler. I had recently changed the namespace of the class file in question to a different but already existing namespace. (I also had using references to the class's new and previous namespaces where I was trying to instantiate it)

Where the compiler was telling me I was missing a reference when trying to instantiate the class, I right clicked and hit "generate class stub". Once Visual Studio generated a class stub for me, I coped and pasted the code from the old class file into this stub, saved the stub and when I tried to compile again it worked! No issues.

Might be a solution specific to my build, but its worth a try.