How instantly free up the memory

[Sudip_inn]

1) in one of my routine i used many list and dataset. i populated those with high volume of data. when event used end then clear memory for list like

list1 = null and GC.Collect() in my routine but i am not sure that memory occupied by List1 is instantly clear or will be clear later. please share the knowledge.

2) in case of dataset i clear like

dataset1.Dispose()

dataset1=null

GC.Collect()

but i am not sure that memory occupied by dataset1 is instantly clear or will be clear later. please share the knowledge.

3) if i call GC.Collect() several time in my one routine does degrade the performance of my application ?

i found one link which said best option to release memory for list this way

first clear List and then call TrimExcess. is it the right one ?

i used like list1=null & GC.Collect()

which one is best to clear memory for list instantly ?

please see my code below which works well.

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;
}
please share best option to clear memory for list & dataset instantly. thanks

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