Setting DefaultValue to first and last date of current month
<p>How can I set the <code>DefaultValue</code>'s in the following code to the start date <em>(first ControlParameter)</em> and last date <em>(second ControlParameter)</em> of the current month?</p>

<pre><code>&lt;SelectParameters&gt;
    &lt;asp:ControlParameter ControlID="txtFromDate" Name="ExpenseDate" PropertyName="Text"
         Type="String" DefaultValue="01-05-2013" ConvertEmptyStringToNull="true" /&gt;
    &lt;asp:ControlParameter ControlID="txtToDate" Name="ExpenseDate2" PropertyName="Text" 
         Type="String" DefaultValue="30-05-2013" ConvertEmptyStringToNull="true" /&gt;
&lt;/SelectParameters&gt;
</code></pre>
