you've got a couple issues going on here....
1.) you're missing the name attribute for your submit button. That name needs to be 'submit' since that is what you're looking for.
2.) $FILE['uploadedfile'] should be $FILE['uploaded'] since that is what you named that file input tag.
Also, I would get in the habit of indenting your code.... it will make your life a lot easier.
<?php
if (!isset($_POST["submit"]))
{
// Now draw default page
echo "<html>
<meta http-equiv=\"Content-Language\" content=\"bn\">
<meta http-equiv=\"Content-Type\" content=\"text/html;charset=UTF-8\">
<head>
<title>Upload file</title>
</head>
<body>
<form enctype=\"multipart/form-data\" action=\"index.php\" method=\"POST\">
Please choose a file: <input name=\"uploaded\" type=\"file\" /><br />
<input type=\"submit\" value=\"Upload\" name=\"submit\"/>
</form>
</body>
</html>";
} else
{
$target = "Upload/";
$target = $target . basename( $_FILES['uploaded']['name']) ;
if(move_uploaded_file($_FILES['uploaded']['tmp_name'], $target))
{
echo "The file ". basename( $_FILES['uploaded']['name']). " has been uploaded";
}
else {
echo "Sorry, there was a problem uploading your file.";
}
}
?>