The quick answer to this, NO. If you have a range validator that appears to want you to have leading zeros chances are you made a bone headed mistake. Much like I did just now. I forgot to set the Type property of my range validator which gave me some interesting results.

The below range validator required me to enter 01 – 100. Another odd thing about this mistake was that a value of 43, had to be 043.

<asp:RangeValidator ID="valrngTest" runat="server" ControlToValidate="txtTest" 
    Text="*" ErrorMessage="Test must be between 0 - 100." SetFocusOnError="true" 
    Display="Dynamic" MinimumValue="0" MaximumValue="100">
</asp:RangeValidator>

This one worked just as you would expect. Notice the addition of the Type=”Integer”.

<asp:RangeValidator ID="valrngTest" runat="server" ControlToValidate="txtTest" 
    Text="*" ErrorMessage="Test must be between 0 - 100." SetFocusOnError="true" 
    Display="Dynamic" MinimumValue="0" MaximumValue="100" Type="Integer">
</asp:RangeValidator>