C# error: Use of unassigned local variable

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I'm not sure why I'm getting this error, but shouldn't this code compile, since I'm already checking to see if queue is getting initialized? 
public static void Main(String[] args) { 
    Byte maxSize; 
    Queue queue; 
 
    if(args.Length != 0) 
    { 
        if(Byte.TryParse(args[0], out maxSize)) 
            queue = new Queue(){MaxSize = maxSize}; 
        else 
            Environment.Exit(0); 
    } 
    else 
    { 
        Environment.Exit(0); 
    } 
 
    for(Byte j = 0; j < queue.MaxSize; j++) 
        queue.Insert(j); 
    for(Byte j = 0; j < queue.MaxSize; j++) 
        Console.WriteLine(queue.Remove()); } 
So if queue is not initialized, then the for loops aren't reachable right? Since the program already terminates with Environment.Exit(0)?
Hope ya'll can give me some point


C# error: Use of unassigned local variable


The compiler doesn't know that the Environment.Exit() is going to terminate the program; it just sees you executing a static method on a class. Just initialize queue to null when you declare it.
Queue queue = null;



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