What is the use of Lock statement in .Net?

What is the use of Lock statement in .Net?
You can use the lock statement for handling critical situation or conditions in your code.

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

Example for Lock statement

lock(this)
{

for(int i = 0; i < 10; i++)
{
//Do your work
}

}