Let the user store value into a string array C#
<p>I'm having some trouble letting a user save his value into an array, here's the code that I tried with:
I want to be able to store up to 4 objects, and then reset them with null, if that is possible.</p>

<pre><code>string [] array = new string[4];
array[i] += Console.ReadLine(); //and now it says: Cannot implicitly convert
 type 'string' to 'int'. I also want to reset the value with this code:

array[i] = null;
</code></pre>

<p>I'm new to arrays and it's really hard. Thanks in advance!</p>