how to set values in a list of objects ?

Hello,

I need to create a 2 dimensional dynamic array. I thought of using a list of objects to do so.
The problem is:
although there are 3 different values added to the list, it finally has 3 elements all equal to the last add ("zzz",3)!!!
I don't understand why??!!

Code:

---

public class myData
        {
            public string str;
            public int cnt;
        }

.....

List<myData> list = new List<myData>();
            myData temp = new myData();
           
            temp.str= "abc";
            temp.cnt = 1;
            list.Add(temp);

            temp.str= "def";
            temp.cnt = 2;
            list.Add(temp);

            temp.str= "zzz";
            temp.cnt = 3;
            list.Add(temp);

            foreach (myData Info in list)
            {....}

---

Can you please tell me how I can have the list values as follow ?
("abc",1)
("def",2)
("zzz",3)


Thank you
Arian

P.S.
I would be thankful for any suggestion to create 2 dimensional dynamic arrays, I am not sure if List of Objects is the best way?!

P.P.S.
I also tried Hashsets but it turned out to be only 1 element in the final set and not 3!!!

Code:

---

HashSet<myData> list = new HashSet<myData> { }

---

I found the reason:
I have to create a new object before any new value.

but still don't know if list of Objects is the best way to create 2 dimensional dynamic arrays or not?!

It depends on what you want to do with the data and, to a lesser extent, what the data is.

Different array objects have different uses, but List is probably the most versatile.

To emulate a 2-dimmensional array, you can create a list of lists:

Code:

---

List<List<myData>> data = new List<List<myData>>();

---

You'll have to create a new list for each outer list. For example:

Code:

---

data[i] = new List<myData>();

---