javascript error CODE for null code example

Example 1: c# error CS0176

error CS0176: Member 'Forest.TreeFacts' cannot be accessed with 
	an instance reference; qualify it with a type name instead
    
/*	This usually means that you tried to reference a static 
	member from an instance, instead of from the class				*/
    
    
    Forest f = new Forest("Congo", "Tropical");

    Console.WriteLine(f.TreeFacts); //Causes Error
    Console.WriteLine(Forest.TreeFacts); //Fixxes Error

Example 2: C# random.Next error

public System.Random r = new System.Random();
public int guess1 = r.Next(0, 100000);