C# Programming/Keywords/else

The else keyword identifies a else clause of an if statement with the following syntax:

if-statement ::= "if" "(" condition ")" if-body "else" else-body

condition ::= boolean-expression

if-body ::= statement-or-statement-block

else-body ::= statement-or-statement-block

An else clause immediately follows an if-body. It provides code to execute when the condition is false. Making the else-body another if statement creates the common cascade of if, else if, else if, else if, else statements:

using System;

public class IfStatementSample
{
    public void IfMyNumberIs()
    {
        int myNumber = 5;
        if (myNumber == 4)
            Console.WriteLine("This will not be shown because myNumber is not 4.");
        else if(myNumber < 0)
        {
            Console.WriteLine("This will not be shown because myNumber is not negative.");
        }
        else if(myNumber%2 == 0)
            Console.WriteLine("This will not be shown because myNumber is not even.");
        else
        {
            Console.WriteLine("myNumber does not match the coded conditions, so this sentence will be shown!");
        }
    }
}

The above example only checks whether myNumber is less than 0, if myNumber is not 4. It in turn only checks whether myNumber%2 is 0, if myNumber is not less than 0. Since none of the conditions are true, it executes the body of the final else clause.

C# Keywords
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Special C# Identifiers (Contextual Keywords)
add alias async await dynamic get global nameof partial remove set value when where yield
Contextual Keywords (Used in Queries)
ascending by descending equals from group in into join let on orderby select where