reg range validator

hi

 <asp:RangeValidator ID="RangeValidator1" runat="server" ErrorMessage="Password must contain more than 6 characters" type="Integer" MaximumValue="10"   MinimumValue="6" ControlToValidate="txtpassword" Display="Dynamic" ></asp:RangeValidator>

above coding i have done for text box valdiation .

After entering the 10 characters as specified in maximum value the cursor allows to enter further characters.How to stop this.

anybody help me out reg this.

thanks

pepin