What List TrimExcess() does and when to use it

[Sudip_inn]

private void button2_Click(object sender, EventArgs e)
{
var before = System.Diagnostics.Process.GetCurrentProcess().VirtualMemorySize64;

List<string> lst1 = new List<string>();

for (int i = 0; i <= 1000000; i++)
{
lst1.Add("Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test ");
}

var after = System.Diagnostics.Process.GetCurrentProcess().VirtualMemorySize64;

lst1.Clear();
lst1.TrimExcess();

var current = System.Diagnostics.Process.GetCurrentProcess().VirtualMemorySize64;
}

i saw TrimExcess() clear memory for list instantly and it is bit better than list = null & GC.Collect....am i right?

one request that please tell me what List TrimExcess() does and when to use it ? please come with a example which explain the objective of List TrimExcess() . i want to understand the actual usage of TrimExcess() function.

thanks

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