Display predetermined xAxis points Asp:Chart

Question

I have 13 points on my X-Axis. 
They always have to appear even if their Y-Value is null.

8 |
7 |                  * 
6 |                  *
5 |*                 *
4 |*       *         *
3 |*   *   *     *   *
2 |* * *   *   * * * *     *
1 |* * *   *   * * * *     *  * 
   _ _ _ _ _ _ _ _ _ _  _  _  _ 
   1 2 3 4 5 6 7 8 9 10 11 12 13

Like in the exemple above, I need to see 4, 6 and 11 even if they are empty. The problem is I never know which 
column is going to be empty and which will not.
Right now I have set IsXValueIndex to true to get the values I want. Filled Points collection in the serie with
my 13 values but I still only have values where Y is not null.  Any idea how I can accomplish this ?

Answer 1

can you show the code on how you populate the Series, please?

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