how can convert php code to C# code

<?php


/*
 * examples/mysql/loaddata.php
 *
 * This file is part of EditableGrid.
 * http://editablegrid.net
 *
 * Copyright (c) 2011 Webismymind SPRL
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://editablegrid.net/license
 */



/**
 * This script loads data from the database and returns it to the js
 *
 */

require_once('config.php');
require_once('EditableGrid.php');

/**
 * fetch_pairs is a simple method that transforms a mysqli_result object in an array.
 * It will be used to generate possible values for some columns.
*/
function fetch_pairs($mysqli,$query){
    if (!($res = $mysqli->query($query)))return FALSE;
    $rows = array();
    while ($row = $res->fetch_assoc()) {
        $first = true;
        $key = $value = null;
        foreach ($row as $val) {
            if ($first) { $key = $val; $first = false; }
            else { $value = $val; break; }
        }
        $rows[$key] = $value;
    }
    return $rows;
}


// Database connection
$mysqli = mysqli_init();
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 5);
$mysqli->real_connect($config['db_host'],$config['db_user'],$config['db_password'],$config['db_name']);

// create a new EditableGrid object
$grid = new EditableGrid();

/*
*  Add columns. The first argument of addColumn is the name of the field in the databse.
*  The second argument is the label that will be displayed in the header
*/
$grid->addColumn('id', 'ID', 'integer', NULL, false);
$grid->addColumn('name', 'Name', 'string');
$grid->addColumn('firstname', 'Firstname', 'string');
$grid->addColumn('age', 'Age', 'integer');
$grid->addColumn('height', 'Height', 'float');
/* The column id_country and id_continent will show a list of all available countries and continents. So, we select all rows from the tables */
$grid->addColumn('id_continent', 'Continent', 'string' , fetch_pairs($mysqli,'SELECT id, name FROM continent'),true);
$grid->addColumn('id_country', 'Country', 'string', fetch_pairs($mysqli,'SELECT id, name FROM country'),true );
$grid->addColumn('email', 'Email', 'email');
$grid->addColumn('freelance', 'Freelance', 'boolean');
$grid->addColumn('lastvisit', 'Lastvisit', 'date');
$grid->addColumn('website', 'Website', 'string');

$result = $mysqli->query('SELECT *, date_format(lastvisit, "%d/%m/%Y") as lastvisit FROM demo LIMIT 100');
$mysqli->close();

// send data to the browser
$grid->renderXML($result);