How to make objects Threadsafe on c#?

Question

I have a an application that requires threading in most cases. Most of the time I will encounter errors or wrong values because the object was updated prior to its execution

Answer 1

Look into using the lock statement for any resources that you need to make thread safe.

http://msdn.microsoft.com/en-us/library/c5kehkcz.aspx

class Account
{
    decimal balance;
    private Object thisLock = new Object();

    public void Withdraw(decimal amount)
    {
        lock (thisLock)
        {
            if (amount > balance)
            {
                throw new Exception("Insufficient funds");
            }
            balance -= amount;
        }
    }
}

This would be my first step. Also you can look into the Monitor class.

http://msdn.microsoft.com/en-us/library/system.threading.monitor.aspx

These are the two basic ways that you can protect your resources during concurrent operations. There are many other ways such as mutexes, sempahores, conditional read/write locks,etc.