couple of problems:
1) The submit button has a space at the end of the name, spaces are not valid in form element names.
change:
<input name="Insert " type="submit" id="Insert " value="Insert Record">
to:
<input name="Insert" type="submit" id="Insert" value="Insert Record">
so that the name does not contain a space.
2) you have 2 server validation on the page, you should only have 1