c# - Use of unassigned local variable `IsZoneEmpty' -

why saying use of unassigned variable iszoneempty. i'm having hard time finding out why. because using variable in if statement.please me. why saying use of unassigned variable iszoneempty. i'm having hard time finding out why. because using variable in if statement.please me.

using unityengine; using system.collections; using system.collections.generic;  public class spawnzone : monobehaviour  {     private vector3 zone1;     private vector3 zone2;     private vector3 zone3;     private vector3 zone4;     private vector3 zone5;      public vector3 zone1l;     public vector3 zone2l;     public vector3 zone3l;     public vector3 zone4l;     public vector3 zone5l;      public gameobject monster;      gameobject spawnedm;      void start ()      {         dictionary <vector3,bool> iszoneempty; new dictionary <vector3,bool>();          {             iszoneempty.add(zone1,true);             iszoneempty.add(zone2,true);             iszoneempty.add(zone3,true);             iszoneempty.add(zone4,true);             iszoneempty.add (zone5,true);              if (iszoneempty[zone1] == true)              {                 spawnedm = instantiate(monster,zone1l, quaternion.identity) gameobject;                 debug.log("monster spawned in zone 1");             }         }     } } 

the first line in start() method should changed

dictionary <vector3,bool> iszoneempty = new dictionary <vector3,bool>(); //(`;` `=`) 

you can make smaller using var

var iszoneempty = new dictionary <vector3,bool>();  

you should initialize variables before using them in c#.