Basic quuestion on heap

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C#

C#4.0

i read about CLR in .net as:

When CLR loads heap is partitioned in SOH and LOH.

1>when application is started at that time heap is allocated by CLR to application depending on its size.

2>LOH heap has Gen0,Gen1,and Gen2 regions.

My question is:
1>Suppose there is 4K heap memory allocated by CLR for Gen0.

 collect = new List();
 while(true)
 {
    collect.Add(new A());
    new A();
    new A();
}
class A
{
  int a=0,b=0;
}
 

Here all objects for A class are allocated on Gen0,

So is it possible for this single thread to use full 4K memory on Gen0.

or there is any restriction on each application such as only 1K is reserved for this application on heap .So that after reaching that limit GC will called to freed up memory from that 1K heap for that application.