generating string from exited characters
<p>I have a character array as shown below :</p>

<pre><code>char[] pwdCharArray = "abcdefghijklmnopqrstuvwxyzABCDEFG" +
            "HIJKLMNOPQRSTUVWXYZ0123456789`~!@#$%^&amp;*()-_=+[]{}\\|;:'\",&lt;" + 
            ".&gt;/?".ToCharArray();
</code></pre>

<p>and from this char array, i want to generate a string of minimum length 7 and all the characters in the string should be from the above char array.
How to do this operation?</p>
