Develop Reference

Tweetinvi namespaces are not recognized although dll's are present

I'm using creating a .Net 4.0 application to post stuff to Twitter using the Tweetinvi API. I can't use packages, so I've downloaded the dll's and added them to my project:
Yet my includes are showing errors:
My error console shows:
Error 423 The type or namespace name 'Core' does not exist in the
namespace 'Tweetinvi' (are you missing an assembly
reference?) {...file...}.cs 10 17 ApiProviders
Can anyone tell me why this happens and how I could fix this?

Tweetinvi requires the Bcl.Async package. You need to add that too.
Check all the dependencies and make shure all are installed.
BUT as already said I highly recommend using NuGet for this. If you are not allowed to use the "public feed" you can download the packages and put them in a local folder and add this folder as a new feed in Visual Studio.

Have you tried downloading the project from the download page?
https://tweetinvi.codeplex.com/downloads/get/852208

Why can't I reference System.Runtime.Serialization.Json in C#

I want to use an API to get info from the interwebz. The API returns data in Json format.
I'm running Microsoft Visual Studio C# 2010 Express addition.
It appears that I have the .NET Framework 4 Client Profile set as my
"Target framework" but I'm honestly not sure exactly what this
means.
This is a Windows Forms Application...
Not much code to show because I can't really get started without the appropriate using statement...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Net;
using System.Runtime.Serialization.Json;
I get this error:
The type or namespace name 'Json' does not exist in the namespace
'System.Runtime.Serialization' (are you missing an assembly
reference?)
Am I missing a DLL file or something? Based on my hours of fruitlessly searching for solutions, I understand that the .NET 4.xx should already have the tools needed to parse up a Json formatted string?

The System.Runtime.Serialization.Json Namespace is in two different DLL's depending on your .net framework.
In .NET 3.5 It is in System.ServiceModel.Web.dll
In .NET 4.0 and above It is in System.Runtime.Serialization.dll.
Make sure you have added the correct DLL as a reference in your project and add using System.Runtime.Serialization.Json; to the top of your code file.
EDIT - Consider using JSON.NET
Even though the .NET Framework supplies its own JSON Serialization and Deserialization namespaces (DataContractJsonSerializer and JavaScriptSerializer) you should investigate whether you would be better off using JSON.NET.
JSON.NET is easier to use, better performance and has far more features.
http://www.newtonsoft.com/json/help/html/JsonNetVsDotNetSerializers.htm

you need to import System.Runtime.Serialization dll from reference

You need to add a reference to your project.
In the Solution Explorer right click references then add reference. You'll see a list of DLL's and you have to check the box next to the one you need for it to be added to the project. After you've done this you can successfully add the using statement.
Hope that helps!

The general process for serializing and deserializing JSON from C# is:
Add a reference to the System.Runtime.Serialization library.
Add using directives for System.Runtime.Serialization and System.Runtime.Serialization.Json.

Please change your Target framework from .NET Framework 4 Client Profile to .NET Framework 4

I know this is an old question, but I came across this in .NET 5.0 and the solution is to add using System.Text.Json to the top of your code.

Visual Stusio doesn't recognize System.Web.DataVisualization

I'm writing a Windows Forms application in C# in Visual Studio.
I'm using the MSChart in my project.
I want to create an object:
public Series myseries = new Series("Default");
The VS doesn't recognize the class Series. As far as I understand, it would be recognized if I write
using System.Web.DataVisualization
If I add using System.Web.DataVisualization then the project doen't recognize DataVisualization . It says that DataVisualization doesn't exist in System.Web.
I looked at the list of references in the project. On the tab .NET I see a reference about System.Web.DataVisualization.dll . To be sure, I found this .dll and dragged it to the project - it didn't help.
I reinstalled MSChart component. No change. The DataVisualization is still not recognized in System.Web.
I've found in the Internet several suggestions how to solve this issue - nothing has helped.
Could you please direct me what may be the reason for DataVisualization being not recognized?
Thanks a lot!

the following line has helped: using System.Web.UI.DataVisualization.Charting

Microsoft.Speech Reference Missing C++/cli

I'm having a hard time finding any information on this so maybe someone here can enlighten me. I've coded a module in C++/Cli, everything is good, but for some reason in the reference list(When I right-click on the VS project to add a reference), I can't find Microsoft.Speech in the list.
There is another one that's equivalent, it's called System.Speech, but I absolutely need Microsoft.Speech. Since the module is pure managed code, shouldn't I have access to all the .NET modules? Or maybe there is a pack I can download to extend it?
Thanks.
Update:
I'm referring to these two calls:
using Microsoft.Speech.AudioFormat;
using Microsoft.Speech.Recognition;
Which can be found in the Kinect SDK samples. I need those in C++/CLI because I cannot access the kinect's recognizer if I use the System native version.

Just in case you are not able to find Microsoft.Speech.dll in the .NET tab, you can do the following:
Import Microsoft.Speech.dll from the following location:
C:\Windows\assembly\GAC_MSIL\Microsoft.Speech\11.0.0.0__31bf3856ad364e35\Microsoft.Speech.dll

Here's the solution :
#using "Microsoft.Speech.dll"
using namespace Microsoft::Speech;
using namespace Microsoft::Speech::Recognition;
Everything now works perfectly.

Namespace in Referenced Project Present in Autocomplete Before Building, but Causes Compile Error After Building

I have a class library project which uses a namespace (e.g., "Cosmos.Creator.Util"). I then create a solution and windows forms application to test the library. From the windows form application, I add a reference to the library. So now I have two projects open in visual studio, a class library and a windows forms project. The forms project references the library.
When I edit my form's code, code autocompletion works correctly for the namespace that I use in the library. E.g., if I type "using Cosmos." I get autocomplete options like "Creator". But now if I build my solution, all of the "Cosmos" are red-underlined with the compile error: "The type or namespace name "Cosmos" could not be found (are you missing a using directive or an assembly reference?)".
For the purposes of the form application test, I placed my library code into a folder CosmosFormExample\Cosmos. When I check the reference from the form application, the reference is to CosmosFormExample\Cosmos\bin\Debug\Cosmos.dll, so that looks okay. I looked at the GUID referenced in the solution file and it matches the GUID of the project file Cosmos.csproj.
What has happened? How has the build caused my forms application to forget about the Cosmos namespace, despite the fact that it is still referencing the library project? Thanks much in advance.

Are you using VS2010 & .NET 4? If so you're probably using .NET 4 Client Profile instead of full fledged .NET 4. Go to project properties and check your Target Framework.
for more info: http://msdn.microsoft.com/en-us/library/cc656912.aspx

you need to check the framework you are using and the framework yout library was compiled for...