[C#] Lock Statement

The lock keyword marks a statement block as a critical section by obtaining the mutual-exclusion lock for a given object, executing a statement, and then releasing the lock. The following example includes a lockstatement.

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;  

The lock keyword ensures that one thread does not enter a critical section of code while another thread is in the critical section. If another thread tries to enter a locked code, it will wait, block, until the object is released.

You can’t use the await keyword in the body of a lock statement.



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