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Asp.Net c# Window Application

I'm creating an Windows Application for the database backup and I've already added the references in my projects.
But I got the error:
'System.Data.SqlClient.SqlError' does not contain a definition for
'Message' and no extension method 'Message' accepting a first argument
of type 'System.Data.SqlClient.SqlError' could be found (are you
missing a using directive or an assembly reference?)
I've already attached the screen shot of the error. Please help me with this issue. Thanks.

As stated in two of the errors, you are missing an assembly reference to System.Data. Add this at the top of your code file (outside of any class or method) as using System.Data; and that should resolve the problem.
Or, right click on the underlined code and use the context menu to automatically add the missing reference.

Type or namespace name 'Data' does not exist in the namespace 'System'

I'm trying to build my first ASP.NET Web Forms project but I'm facing some serious problem.
I created two project files in my project named: BLL and DAL.
I created classes named class.cs and class1.cs in both the above files respectively. When I add using System.Data; in any of the .cs files, it displays the following errors:
1: Error CS0234 The type or namespace name 'Data' does not exist in the namespace 'System' (are you missing an assembly reference?) DAL..NET Platform 5.4
2. Error CS0234 The type or namespace name 'Data' does not exist in the namespace 'System' (are you missing an assembly reference?) BLL..NET Platform 5.4
I tried adding assembly references by right click on references -> Add reference -> Checking System.Data and rebuilding it again but it didn't help me.
When I hover mouse over using System.Data; it displays the following thing:

First when you hover your "System.Data" it shows a message, which is pretty much straight forward to understand that you haven't used any classes of System.Data. When you implement those classes, this message will disappear.
Second, You got an error -
Error CS0234 The type or namespace name 'Data' does not exist in
the namespace 'System' (are you missing an assembly reference?)
DAL..NET Platform 5.4
So basically you have to have an assembly refernce of System.Data into your project.
Go to References and check whether System.Data Assembly exist or not. If not then install it.
Hope this will help you.

You are simply missing the "System.Data" reference.
In Solutions Explorer window right click on the 'Reference' entry -> Press Add Reference -> click on Assemblies > Search for 'System.Data' -> press the check box ( I always forget this step.) -> press OK.

your namespace and class name is same,
rename your class name.

'GZipStream' could not be found - reference issue

I can't get to use GZipStream class in my C# ASP.NET 4.5 application.
I get the error:
The type or namespace name 'GZipStream' could not be found (are you missing a using directive or an assembly reference?)
I tried using using System.IO; but the System.IO.Compression is not available in the "Reference Manager" in visual studio. I right click on the object name to see if Visual Studio finds the relevant reference but it does not.
Any suggestions?

Need to add reference to System.dll assembly and using System.IO.Compression namespace.
MSDN: GZipStream Class

The namespace is not the same as the dll name,You need to add a dll reference to the assembly, System.IO.Compression.FileSystem.dll

Error Attempting to Call a WPF Form From Console App

I have a console Application and I need to occasionally launch a WPF form depending on the parameters. I and trying the following:
if (arg == "/C")
{
System.Windows.Application application = new System.Windows.Application();
application.Run(new EJConfig.MainWindow());
}
The problem is that when I go to add a reference to System.Windows, it doesn't show up in the list of .NET components, and without it I get the following error:
The type or namespace name 'Windows' does not exist in the namespace 'System' (are you missing an assembly reference?)

Have you tried adding:
using System.Windows;
To the top of the c# file? You may also need these assemblies:
Assembly: PresentationFramework (in PresentationFramework.dll)
Assembly: PresentationCore (in PresentationCore.dll
Check it out here

you need to add the PresentationFramework and PresentationCore assemblies to your project.
The System.Windows.Application class is located in the PresentationFramework assembly, but you'll also need PresentationCore for it to work.
source:
http://msdn.microsoft.com/en-us/library/system.windows.application.aspx

You are probably missing additional references besides System.Windows. I don't know which are required. You could find out by creating a default application and check the references listed.

Tesseract - Add reference does not works

I'm following the steps:
Download binary here, add a reference of the assembly Tessnet2.dll to your .NET project.
Download language data definition file here and put it in tessdata directory. Tessdata directory and your exe must be in the same directory.
Look at the Program.cs sample
if I call the class from lib using:
tessnet2.Tesseract ocr = new tessnet2.Tesseract();
I'm getting the following error:
Name Namespace or type 'tessnet2' could not be found.
Need a using directive or a set of reference
Modules (assembly)?
How I solve this?
Thanks!

There are two DLL versions for tessnet2: 32- and 64-bit. Make sure you add the correct one to your project. Check VietOCR.NET 2.0x for a working example of using tessnet2.

The error says that it can't find the namespace - even though you've added a reference to it, do you either name it using the full namespace, or can you include it as a "using" at the top of the cs file?
For reference, the translated error (from Portuguese) is:
Namespace or type 'tessnet2' could not be found. Need a using
directive or an assembly reference (assembly)?