<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<form method="post" enctype="multipart/form-data" action="url地址">
<input type="hidden" name="act" value="Send">
<label>FKSAuthKey:</label> <input type="text" name="FKSAuthKey" value=""> <br>
<label>rcpt</label><input type=text name=rcpt><br>
<label>body</label><textarea name="body" rows=10 cols=100></textarea><br>
<input type="file" name="file[]"></br>
<input type="file" name="file[]">
<button type=submit>Submit</button>
</form>
</body>
</html>
上面这段代码在ASP.net(c#)的后台中如何实现。