<form action="/Home/UploadA" method="post" enctype="multipart/form-data">
<input id="file1" name="file" type="file" /><input type="submit" id="btn1" value="第1种方法" /><br /><br />
</form>
<form action="/Home/UploadA" method="post" enctype="multipart/form-data">
<input id="file1" name="file" type="file" /><input type="submit" id="btn1" value="第1种方法" /><br /><br />
</form>