求PHP代码翻译asp.net

<?php
        $process = curl_init('http://v0.api.');

        /// 上传请求
        curl_setopt($process, CURLOPT_PUT, 1);
        curl_setopt($process, CURLOPT_USERPWD, "demouser:demopass");
        curl_setopt($process, CURLOPT_HEADER, 0);
        curl_setopt($process, CURLOPT_TIMEOUT, 60);

        $datas = fopen("{$file_path}",'r');
 fseek($datas, 0, SEEK_END);
 $file_length = ftell($datas);
 fseek($datas, 0);

        /// 设置图片的内容
        curl_setopt($process, CURLOPT_INFILE, $datas);

        /// 设置图片的长度
 curl_setopt($process, CURLOPT_INFILESIZE, $file_length);

        /// 设置图片的裁剪参数:从左上角开始，裁剪一张55px宽，40px高的图片
        curl_setopt($process, CURLOPT_HTTPHEADER, array('x-gmkerl-crop: 0,0,55,40'));
        
        /// 执行并返回结果，正常的话将返回true
        var_dump(curl_exec($process));
        /// 获取http状态码，正常的话将返回200
        var_dump(curl_getinfo($process, CURLINFO_HTTP_CODE));

        /// 关闭资源
        curl_close($process);
        fclose($datas);
?>