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Keywords in C#

Keywords in C# are reserved words that have predefined meanings and cannot be used as identifiers (variable names, class names, method names, etc.) in the program. They are used to specify different aspects of the program’s structure, behavior, and control flow.

Examples of Keywords:

Here are a few examples of keywords in C#:

class MyClass {
  public int myPublicInt;
  private string myPrivateString;
  protected double myProtectedDouble;
  static float myStaticFloat;
  const decimal myConstantDecimal = 3.14m;
  volatile int myVolatileInt;
  override void MyMethod() { }
  sealed class MySealedClass { }
  abstract void MyAbstractMethod();
  try { }
  catch (Exception ex) { }
  finally { }
  if (myPublicInt > 0) { }
  else if (myPublicInt < 0) { }
  else { }
  for (int i = 0; i < 10; i++) { }
  foreach (var item in myCollection) { }
  while (myPublicInt < 100) { }
  switch (myPublicInt) { case 0: break; default: break; }
  return;
  void MyVoidMethod() { }
  int MyIntMethod() { return 0; }
  string MyStringMethod() { return ""; }
  delegate int MyDelegate(int a, int b);
  async Task MyAsyncTask() { }
  using (var myResource = new MyResource()) { }
  lock (myLockObject) { }
  checked { }
  unchecked { }
}

Rules:

Here are some rules to keep in mind when working with keywords in C#:

Keywords in C# are case-sensitive and must be spelled correctly.
Keywords cannot be used as variable names, class names, or method names, and will result in a compile-time error if attempted.
Keywords should be used according to their intended purpose, and not used for any other purpose in the program.

List of Keywords in C#:

Here is a list of all the keywords in C# with a quick overview of each one:

Keyword	Description
abstract	Used to define abstract classes and methods.
as	Used to perform an explicit reference conversion.
base	Used to access members of the base class.
bool	Defines a Boolean data type.
break	Used to exit a loop or switch statement.
byte	Defines an 8-bit unsigned integer data type.
case	Used in a switch statement to match a value.
catch	Used to handle exceptions.
char	Defines a character data type.
checked	Used to enable overflow checking for integral-type arithmetic operations.
class	Defines a class.
const	Defines a constant value.
continue	Used to skip to the next iteration of a loop.
decimal	Defines a decimal data type.
default	Used in a switch statement to define a default case.
delegate	Used to define a delegate type.
do	Used to start a do-while loop.
double	Defines a double-precision floating-point data type.
else	Used to define an alternative branch in an if statement.
enum	Defines an enumerated data type.
event	Used to define an event.
explicit	Used to define explicit conversion operators.
extern	Used to declare a method that is implemented externally.
false	Represents the Boolean value false.
finally	Used to define a block of code that is executed after a try block.
fixed	Used

Keyword	Description
float	Defines a single-precision floating-point data type.
for	Used to define a for loop.
foreach	Used to iterate over the elements of a collection.
goto	Used to transfer control to another point in the program.
if	Used to define a conditional statement.
implicit	Used to define implicit conversion operators.
in	Used in a foreach loop to specify the collection to iterate over.
int	Defines a 32-bit signed integer data type.
interface	Defines an interface.
internal	Used to define a member that is accessible within the current assembly.
is	Used to test an object for compatibility with a type.
lock	Used to acquire a mutual-exclusion lock.
long	Defines a 64-bit signed integer data type.
namespace	Defines a namespace.
new	Used to create a new instance of a class or value type.
null	Represents a null reference.
object	Defines a reference data type.
operator	Used to define operator overloading methods.
out	Used to pass a parameter by reference.
override	Used to override a virtual or abstract member of a base class.
params	Used to define a method that takes a variable number of arguments.
private	Used to define a member that is accessible only within its declaring class.
protected	Used to define a member that is accessible within its declaring class and its derived classes.
public	Used to define a member that is accessible from any code.
readonly	Used to define a field that can be set only in its declaration or constructor.
ref	Used to pass a parameter by reference.
return	Used to return a value from a method.
sbyte	Defines an 8-bit signed integer data type.
sealed	Used to prevent a class from being inherited.
short	Defines a 16-bit signed integer data type.
sizeof	Used to obtain the size of a value type.
stackalloc	Used to allocate a block of memory on the stack.
static	Used to define a member that belongs to the class itself, rather than to a specific instance.
string	Defines a string data type.
struct	Defines a value type.
switch	Used to define a switch statement.
this	Used to refer to the current instance of a class.
throw	Used to raise an exception.
true	Represents the Boolean value true.
try	Used to define a block of code that might throw an exception.
typeof	Used to obtain the System.Type object for a type.
uint	Defines a 32-bit unsigned integer data type.
ulong	Defines a 64-bit unsigned integer data type.
unchecked	Used to disable overflow checking for integral-type arithmetic operations.
unsafe	Used to define unsafe code that can access unmanaged memory.
ushort	Defines a 16-bit unsigned integer data type.
using	Used to define a namespace alias or to declare that a resource is no longer needed.
virtual	Used to define a member that can be overridden in a derived class.
void	Used to define a method that does not return a value.
volatile	Used to indicate that a field can be modified by multiple threads.
while	Used to define a while loop.

C#

Keywords in C#

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