How to Implement IComparable interface?

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You should not define IComparable yourself. It is already defined. Rather, you need to implement IComparable on your BankAccount class.

Where you defined the class BankAccount, make sure it implements the IComparable interface. Then write BankAccount.CompareTo to compare the balance amounts of the two objects.

public class BankAccount : IComparable<BankAccount>
{
    [...]

    public int CompareTo(BankAccount that)
    {
        if (this.Balance <  that.Balance) return -1;
        if (this.Balance == that.Balance) return 0;
        return 1;
    }
}

Edit to show Jeffrey L Whitledge’s solution from comments:

public class BankAccount : IComparable<BankAccount>
{
    [...]

    public int CompareTo(BankAccount that)
    {
        return this.Balance.CompareTo(that.Balance);
    }
}

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