We Keep Coding

Does anyone know why system and console isn't working here?

using System;
using SplashKitSDK;
public class Program
{
public static void Main()
{
console.WriteLine("Hello World");
}
}
Some of the errors I am getting:
Unnecessary using directive. [Helloworld]csharp(CS8019)
The type or namespace name 'System' could not be found (are you missing a
using
directive or an assembly reference?) [Helloworld, Helloworld, Helloworld,
Helloworld]csharp(CS0246)
Predefined type 'System.Object' is not defined or imported
The name 'Console' does not exist in the current context
I've tried everything, and nothing seems to work. I also believe I installed the language tools and library correctly. If anyone knows how to fix this please let me know. Thanks!

Error CS0234: The type or namespace name 'CustomMarshalers' does not exist in the namespace 'System.Runtime.InteropServices'

using System;
using System.Collections;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.CustomMarshalers;
namespace mshtml
{
[DefaultMember("item"), CompilerGenerated, Guid("3050F21F-98B5-11CF-BB82-00AA00BDCE0B"), TypeIdentifier]
[ComImport]
public interface IHTMLElementCollection : IEnumerable
{
void _VtblGap1_3();
[DispId(-4)]
[return: MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(EnumeratorToEnumVariantMarshaler))]
IEnumerator GetEnumerator();
}
}
The above code gives me the following error:
Error CS0234: The type or namespace name 'CustomMarshalers' does not exist in the namespace 'System.Runtime.InteropServices' (are you missing an assembly reference?)
Pleae advise how to fix? It's a decompiled code, and I am very beginner in C#.

You have to include CustomMarshalers.dll
Example:
Add the reference using Project -> Add Reference -> Browse -> Go to location "C:\Windows\assembly\GAC_32\CustomMarshalers\2.0.0.0__b03f5f7f11d50a3a" -> Select CustomMarshalers.dll

Sorry for resurrecting an old thread. With Framework 4.72, you can use Project -> Add Reference -> Assemblies -> Check the box next to CustomMarshalers.

System.Xml in visual studio not working

I am trying to process XML with C# in Visual Studio and it will not allow me to import System.Xml. I looked at other posts about this problem and this was usually caused by misspelling System.Xml to System.XML. I have the right spelling so I am not sure what is causing me problems. I looked under references and there is no System.Xml and I am using Visual Studio 2013 The error message was
Error 1 The type or namespace name 'Xml' does not exist in the namespace 'System' (are you missing an assembly reference?)
Do I have to download System.Xml?
Here is the code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
namespace WebTesting
{
class Test1
{
public static void Main(string [] args)
{
using(XmlReader reader = XmlReader.Create("myData.Xml"))
{
while(reader.Reader())
{
if(reader.IsStartElement())
{
Console.Write("The start element is " + reader.ReadString());
}
}
}
Console.ReadLine();
}
}
}

You'll need to add an assembly reference. Right-click "References" under your project in Solution Explorer and select "Add Reference..." Switch to the .NET tab and find System.Xml. Click OK.

by using XDocument (in using System.Xml.Linq;) you'll get more flexible functionality to handling XML-documents

Convert LinqPad C# Program to Visual Studio C# Console Program

This seems obvious but I cannot see an easy way to to do this.
I have written a C# Program in LinqPad and it runs well, is there a guide for moving this to a Visual Studio Console Program.
A simple program such as this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
DataContext dataContext = this;
var products = dataContext.GetTable<Product>();
var query = from p in products
select p;
query.Dump();
}
}
}
produces these errors:
Error 1 The type or namespace name 'DataContext' could not be found (are you missing a using directive or an assembly reference?) c:\users\xxx\documents\visual studio 2013\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs
Error 2 Keyword 'this' is not valid in a static property, static method, or static field initializer c:\users\xxx\documents\visual studio 2013\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs
Error 3 The type or namespace name 'Product' could not be found (are you missing a using directive or an assembly reference?) c:\users\xxx\documents\visual studio 2013\Projects\ConsoleApplication1\ConsoleApplication1\Program.cs 14 49 ConsoleApplication1
I must have to add some references, add a connection to the database, I just need a guide for what to add to my project but I cannot find one.

Error Id: CS0234, Error: The type or namespace name 'Xml' does not exist in the namespace 'System.Security.Cryptography'

I am using an online IDE (http://www.frosthawk.net/) to run my C# code and upon compilation I get the error
Error Id: CS0234, Error: The type or namespace name 'Xml' does not exist in the namespace 'System.Security.Cryptography' (are you missing an assembly reference?), Line: 26, Column: 36
Can anybody tell me how to add this reference to my code whicle using the the online IDE as I cannot right click and Add Reference that we used to do normally
using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Security.Cryptography.Xml;
using System.Text;
using System.Xml;
public class SignVerifyEnvelope
{
public static void Main(String[] args)
{
try
{
......

Perhaps you missed this:
// IMPORTANT How-To-Use:
// # Add/Manage References by clicking the 'References' link
// # Manage Your Build Settings by clicking the 'Settings' link
Click references and fix your reference.
If you are unsure which reference you require, you may need to browse MSDN for help. For reference here is the System.Security namespace.