Checking string value in a string using c# : <p>I have following code in my project</p>

<pre><code>var ReturnStr = Final_BOM.Tables[0].Rows[0]["NEW_BOM_IDS"].ToString();
</code></pre>

<p>the above line returns "12,13" but some times only "12"</p>

<pre><code>var ReturnBOM = dsBOMDEfault.Tables[0].Rows[0]["Item_ID"].ToString();
</code></pre>

<p>the above line returns "14,15,13".</p>

<p>I want to check ReturnBOM values in ReturnStr </p>

<p>Can any one help how to check</p>
