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 thi

Answer 1

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

Answer 2

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

Answer 3

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?

Answer 4

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..."

Answer 5

In some cases, when necessary using has been obviously added and studio can't see this namespace, studio restart can save the day.

Answer 6

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...