I m getting the missing a using directive or assembly reference and no clue what s going wrong

Question

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 lt int  CompanyConfigElement gt                   Elements               static CompaniesConfig                                         Elements   new Dictionary lt int  CompanyConfigElement gt                            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 lt CompanyConfigElement gt  Companies                                                 get                                       return Elements Values ToList                                                      Any help is appreciated

User · Answer

Your using statements appear to be 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

User · Answer

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

User · Answer

The following technique worked for me   1  Right click on the project Solution -  Click on Clean solution  2  Right click on the project Solution -  Click on Rebuild solution

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

In some cases  when necessary using has been obviously added and studio can t see this namespace  studio restart can save the day

User · Answer

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

[c#] I'm getting the "missing a using directive or assembly reference" and no clue what's going wrong

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