C# manual lock/unlock

Question

I have a function in C# that can be called multiple times from multiple threads and I want it to be done only once so I thought about this:

class MyClass
{
          


        

Answer 1

The lock keyword is just syntactic sugar for Monitor.Enter and Monitor.Exit:

Monitor.Enter(o);
try
{
    //put your code here
}
finally
{
    Monitor.Exit(o);
}

is the same as

lock(o)
{
    //put your code here
}