Textbox to accept only 11 digits but not all zero

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C#

.NET

hi ,
i use comparevalidator like this:

<asp:CompareValidator runat="server" id="cmpNumbers" controltovalidate="txtTIN"
ValueToCompare="000000000" operator="GreaterThan" type="Integer" errormessage="Invalid Tin Number" />

but it shows error msg in both condition weather i enter 00000000000 or 12345678912 why so.
and i am checking foe 11 digit no. and you suggest value to compare only 9 digit 000000000.
pls explain, and help.