check the string having full number or the combinbation of number and string
<p>I want to check whether a string is only numeric, or is alphanumeric.</p>

<p>For example :</p>

<pre><code>string test = "2323212343243423333";
string test1 = "34323df23233232323e";
</code></pre>

<p>I want to check test having number only or not. If the whole string having number means it returns true. Otherwise it returns false.</p>

<p>How can i do this?</p>
