Cannot access array of a custom class - unity3d

Question

In unity I keep getting the error message "NullReferenceException: Object reference not set to an instance of an object" on this:
listOfBanks[0].Deposit(50);
and
accntBlnce.text = "Account Balance:\n" + listOfBanks[curBank].GetBalance().ToString("c");
I have 3 options listed in the drop down menu and when I Debug.Log the number of items in the array I get 3 as my count. But I can't do anything with them. The banks variable is set as the Dropdown object in the inspector as well as the accntBlnce as the text object in my panel.
The code is below.
Banks.cs
public class Banks : MonoBehaviour {
public Dropdown banks;
public Text accntBlnce;
public Bank[] listOfBanks;
public int curBank = 0;
void Start() {
listOfBanks = new Bank[banks.options.Count];
listOfBanks[0].Deposit(50);
}
void Update() {
curBank = banks.value;
accntBlnce.text = "Account Balance:\n" + listOfBanks[curBank].GetBalance().ToString("c");
}
}
Bank.cs
public class Bank{
public Bank() { }
public Bank(string orgn, float amntToRprt, float blnce) {
origin = orgn;
amountToReport = amntToRprt;
balance = blnce;
}
public string origin { get; set; }
public float amountToReport { get; set; }
public float balance { get; set; }
public bool Deposit(float amnt) {
if (amnt > 0) {
balance += amnt;
if(amnt > amountToReport) {
FlagForReport();
}
return true;
}
else
return false;
}
private void FlagForReport() {
throw new NotImplementedException();
}
public float GetBalance() {
return balance;
}
public bool Withdraw(float amnt) {
if (amnt > 0) {
if (balance >= amnt) {
balance -= amnt;
return true;
}
else
return false;
}
else
return false;
}
public bool Transfer(float amnt, Bank bank) {
if (amnt > 0) {
if (balance >= amnt) {
if(bank.Deposit(amnt))
balance -= amnt;
return true;
}
else
return false;
}
else
return false;
}
}

Answer 1

This is the fourth time array question is asked this week with the-same problem and the-same solution.
You declared the array here:
listOfBanks = new Bank[banks.options.Count];
but you did not create new instance of each Bank script before calling
listOfBanks[0].Deposit(50); and listOfBanks[curBank].GetBalance().ToString("c").
Declaring array and setting the size is NOT the-same as creating new instance of a script.
The solution is to loop through the array and create new instance of each one.
In your Banks.cs, replace the code in your Start() function with the one below:
void Start()
{
//Declare how much Bank array should be created
listOfBanks = new Bank[banks.options.Count];
//Now Create instance of each bank
for (int i = 0; i < listOfBanks.Length; i++)
{
//Create new instance of each Bank class
//listOfBanks[i] = new Bank();
listOfBanks[i] = new Bank("", 50, 50);
}
listOfBanks[0].Deposit(50);
}