try, catch, finally, throw C# with Example

try, catch, finally, and throw allow you to handle exceptions in your code. 
var processor = new InputProcessor(); 
// The code within the try block will be executed. If an exception occurs during execution of 
// this code, execution will pass to the catch block corresponding to the exception type. 
try 
{ 
processor.Process(input); 
} 
// If a FormatException is thrown during the try block, then this catch block 
// will be executed. 
catch (FormatException ex) 
{ 
// Throw is a keyword that will manually throw an exception, triggering any catch block that is 
// waiting for that exception type. 
throw new InvalidOperationException("Invalid input", ex); 
} 
// catch can be used to catch all or any specific exceptions. This catch block, 
// with no type specified, catches any exception that hasn't already been caught 
// in a prior catch block. 
catch 
{ 
LogUnexpectedException(); 
throw; // Re-throws the original exception. 
} 
// The finally block is executed after all try-catch blocks have been; either after the try has 
// succeeded in running all commands or after all exceptions have been caught. 
finally 
{ 
processor.Dispose(); 
} 
Note: The return keyword can be used in try block, and the finally block will still be executed (just before 
 

returning). For example: 
try 
{ 
connection.Open(); 
return connection.Get(query); 
} 
finally 
{ 
connection.Close(); 
} 
The statement connection.Close() will execute before the result of connection.Get(query) is returned.