title: Doesn't clears the label messages on changing the selection using calendar control
body: <p>Below is my aspx code for text box and calendar control and text box which displays an error message if the selected from date and to date is not in the range,the problem is i am getting error message but on again changing the date by using date picker i am unable to clear the label message not a valid document</p>
  
  <pre><code>&lt;tr&gt;
                          &lt;td style="width:100px; text-align:left; padding-left:10px;"&gt;From Date:&lt;/td&gt;
                          &lt;td style="width:200px; text-align:left;"&gt;&lt;asp:TextBox ID="txtfromdate" runat="server" Width="120px" CssClass="Calender"&gt;&lt;/asp:TextBox&gt;&lt;/td&gt;
                          &lt;td style="width:100px; text-align:left; padding-left:10px;"&gt;To Date:&lt;/td&gt;
                          &lt;td style="width:200px; text-align:left;"&gt;&lt;asp:TextBox ID="txtToDate" runat="server" Width="120px" CssClass="Calender"&gt;&lt;/asp:TextBox&gt; &lt;/td&gt;
                          &lt;td style="width:250px;"&gt;&lt;/td&gt;
                      &lt;/tr&gt;
  </code></pre>