C#上传文件时找不到文件~求解~！！

//后台代码
public static class Qiniu_API
{
public static string Bucket = "";//空间名
public static string Domain = "";//域名

    static Qiniu_API()
    {
        Config.ACCESS_KEY = "<AK>";  //AK
        Config.SECRET_KEY = "<SK>";//SK
    }

    public static void ResumablePutFile(string bucket, string key, string fname)
    {
        Console.WriteLine("\n===> ResumablePutFile {0}:{1} fname:{2}", bucket, key, fname);
        PutPolicy policy = new PutPolicy(bucket, 3600);
        string upToken = policy.Token();
        Settings setting = new Settings();
        ResumablePutExtra extra = new ResumablePutExtra();
        ResumablePut client = new ResumablePut(setting, extra);
        client.PutFile(upToken,fname, key);
    }
}


protected void confirm_Click(object sender, EventArgs e)
{ 
    HttpFileCollection collection = HttpContext.Current.Request.Files;
    HttpPostedFile file = collection[0];
    string bucket = "maitian";
    Qiniu_API.ResumablePutFile(bucket, null, file.value);
}


    点击后显示：

检查下文件路径，另外中文文件名编码是否正确