c# - Validating exact length of value -

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i using microsoft visual developer c#. trying validate textbox book code (int) entered 4 characters long. used range validator control so. maximumvalue , minimumvalue properties of range validator made them both equal 4. doesnt seem work. doing wrong?

this simple, should thinking more problem before posting. however, empathize beginner , give couple of solutions.

option 1 - convert string , check it's length;

 string myvar = bookcode.tostring()  if (myvar.length < 5)      // it's good!  else     // error

option 2 - largest value less ten thousand 9999, 4 digit value.

 if (bookcode < 10000)      // it's   else     // it's bad

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