Summary Moc Programming In C# 20483B

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• The .NET Framework 4.5 provides three principal elements:

  The Common Language Runtime (CLR). 
  The .NET Framework class library. 
  A collection of development frameworks.
• The CLR manages the execution of code and simplifies the development process by providing a robust and highly secure execution environment that includes:

  • Memory management.
  • Transactions.
  • Multithreading.
• The .NET Framework provides several development frameworks that you can use to build common application types, including:

  Desktop client applications, by using Windows Presentation Foundation (WPF). 
  
  Windows 8 desktop applications, by using XAML. 
  
  Server-side web applications, by using Active Server Pages (ASP.NET) Web Forms or ASP.NET MVC. 
  
  Service-oriented web applications, by using Windows Communication Foundation (WCF).
  
  Long-running applications, by using Windows services.
• Visual C# is a type-safe language, which means that?

  the compiler guarantees that values stored in variables are always of the appropriate type.
• Operators fall into the following three categories:

  • Unary. This type of operator operates on a single operand. For example, you can use the - operator as a unary operator. To do this, you place it immediately before a numeric operand, and it converts the value of the operand to its current value multiplied by –1.
  
  • Binary. This type of operand operates on two values. This is the most common type of operator, for example, *, which multiplies the value of two operands.
  
  • Ternary. There is only one ternary operator in Visual C#. This is the ? : operator that is used in conditional expressions.
• Which rules apply to identifiers?

  
  An identifier can only contain letters, digits, and underscore characters.
  
  
  An identifier must start with a letter or an underscore.
  
  
  An identifier for a variable should not be one of the keywords that Visual C# reserves for its own use.
• can u use an unassigned variable?

  Visual C# does not allow you to use an unassigned variable.
•  When the compiler sees the var keyword...

   it uses the value that is assigned to the variable to determine the type.
• There are two types of conversions in the .NET Framework:

  •
  Implicit conversion, which is automatically performed by the CLR on operations that are guaranteed to succeed without losing information.
  •
  Explicit conversion, which requires you to write code to perform a conversion that otherwise could lose information or produce an error.
• Visual C# prohibits implicit conversions that:

  lose precision