Lock Statement in C#.net

Lock Statement in C#.net (much usefull for bank transaction)

In .NET we can lock some object while threading once execution over and then releasing the lock.Its very usefull for bank transaction
the following example guide you to learn about Lock Statement

Syntax:

Object myLock = new Object();
lock (myLock)
{
// code section like any bank transaction
}

Explanation
Lock statement ensures that one thread does not enter a code section while another thread is in the code section. If another thread attempts to enter

a locked code, it will wait, block, until the object is released.

Example:


namespace Lock
{
class Program
{
static void Main(string[] args)
{
Thread[] threads = new Thread[10];
Account acc = new Account(1000);
for (int i = 0; i < 10; i++)
{
Thread t = new Thread(new ThreadStart(acc.MyTransactions));
threads[i] = t;
}
for (int i = 0; i < 10; i++)
{
threads[i].Start();
}
Console.Read();
}
}

class Account
{
private Object myLock = new Object();
int Bal;

Random rnd = new Random();

public Account(int iniAmount)
{
Bal = iniAmount;
}

int Withdraw(int amt)
{

// This condition will never be true unless the lock statement
// is commented out:
if (Bal < 0)
{
throw new Exception("Negative Balance");
}

// Comment out the next line to see the effect of leaving out
// the lock keyword:
lock (myLock)
{
if (Bal >= amt)
{
Console.WriteLine("Balance before Withdrawal : " + Bal);
Console.WriteLine("Amount to Withdraw : -" + amt);
Bal = Bal - amt;
Console.WriteLine("Balance after Withdrawal : " + Bal);
return amt;
}
else
{
return 0; // transaction rejected
}
}
}

public void MyTransactions()
{
for (int i = 0; i < 100; i++)
{
Withdraw(rnd.Next(1, 100));
}
}
}

}

Regard

Prateek