how to add varibale to list

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hi i want to add value of a variable to a list and then change the value,
for example:

C#

static List<int> list = new List<int>();
int i=2;
list.Add(i);
int i=3;
list.Add(i);

but when i change the value of int the value of list will change.
please help me.

[edit]Code block added - OriginalGriff[/edit]

Posted 12-Jan-15 7:29am

mohamad atrian

Updated 13-Jan-15 5:24am

OriginalGriff

v2

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Sergey Alexandrovich Kryukov 12-Jan-15 19:18pm

What is that type, "List"? It could be System.Collections.Generic.List<int>...
Now, how do you "change the value of int"? What would you expect and why?
Understand simple thing: you don't add "variables", but objects. Can you see the difference?
—SA

Tomas Takac 13-Jan-15 11:31am

Not clear. What is the problem? Your list will contain 2 and 3. Do you expect something else?

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OriginalGriff · Answer 1 · 2015-01-13T05:30:00

No, it won't.
Integers are "value types" which means that when you use them you get a copy of the value instead of affecting the original.
If we make your code compile:

C#

List<int> list = new List<int>();
int i=2;
list.Add(i);
i=3;
list.Add(i);

Your list will end up with two different values on it: 2 and 3.
Try it:

C#

List<int> list = new List<int>();
int i = 2;
list.Add(i);
i = 3;
list.Add(i);
i = 4;
foreach (int item in list)
    {
    Console.WriteLine(item);
    }
list[1] += 10;
Console.WriteLine();
foreach (int item in list)
    {
    Console.WriteLine(item);
    }

You will get: