Your page has two separate forms:
<form id="form1" name="form1" enctype="multipart/form-data" method="post" action="">
<label>Upload File
<input type="file" name="Upload" id="Upload" />
</label>
</form>
<form id="form2" name="form2" method="post" action="">
<label>
<input type="submit" name="submit " id="submit " value="Submit" />
</label>
</form>
The file element is in one form, the submit button is in another.
When you click the submit button, it will only post elements that are a member of that. you need to combine the two forms into one:
<form id="form1" name="form1" enctype="multipart/form-data" method="post" action="">
<label>Upload File
<input type="file" name="Upload" id="Upload" />
</label><br />
<label>
<input type="submit" name="submit " id="submit " value="Submit" />
</label>
</form>