How can I run two PHP scripts from C#

private void btnDisplay_Click(object sender, EventArgs e)
        {
            try
            {
                _dbConnection.Open();
                const string selectQuery =
                    "SELECT * FROM tbl_sales WHERE (row_inserted_on >= @dtp_last_updated) AND (last_edited_on >= @dtp_last_updated)";

                using (var cmdLocal = new MySqlCommand(selectQuery, _dbConnection))
                {
                    cmdLocal.Parameters.Add("@dtp_last_updated", MySqlDbType.DateTime).Value =
                        DateTime.Parse(dtpLastServerUpdated.Text);
                    cmdLocal.Connection = _dbConnection;
                    cmdLocal.CommandText = selectQuery;
                    _dbDataAdapter = new MySqlDataAdapter();
                    _dbDataAdapter.SelectCommand = cmdLocal;
                    _dbDataTable = new DataTable();
                    _dbDataAdapter.Fill(_dbDataTable);
                    dataGridView1.DataSource = _dbDataTable;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            finally
            {
                _dbDataAdapter.Dispose();
                _dbConnection.Close();
            }
        }

private void btnExportToJson_Click(object sender, EventArgs e)
        {
            var jasonData = (DataTableToJson(_dbDataTable));
            //MessageBox.Show(afd);
            System.IO.File.WriteAllText(@"C:\Users\BAALAN-PC\Desktop\path.json", jasonData);
            Application.Exit();
        }

private void btnHttpRequest_Click(object sender, EventArgs e)
        {
            try
            {
                WebClient client = new WebClient();
                string myFile = @"C:\Users\BAALAN-PC\Desktop\path.json";
                client.Credentials = CredentialCache.DefaultCredentials;
                client.UploadFile(@"http://myWeb.com/myWorkDb/fileUpload.php", "POST", myFile);
                client.Dispose();
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }

        }

<?php
    try
    {
        $connect = mysqli_connect("localhost", "fiart", "", "dbsync");    
        $query = '';
        $table_data = '';
        $filename = "path.json";

        $data = file_get_contents($filename);
        $array = json_decode($data, true); 

        foreach($array as $row) 
        {
            $query .= "INSERT INTO tbl_sales(sale_item, sale_qty, row_inserted_on, last_edited_on, id) VALUES ('".$row["sale_item"]."', '".$row["sale_qty"]."', '".$row["row_inserted_on"]."', '".$row["last_edited_on"]."', '".$row["id"]."') ON DUPLICATE KEY UPDATE sale_item='".$row["sale_item"]."', sale_qty='".$row["sale_qty"]."', row_inserted_on='".$row["row_inserted_on"]."', last_edited_on='".$row["last_edited_on"]."';";
        }

            mysqli_multi_query($connect, $query);  

            echo "<h1>All data appeded </h1>";
    } 

    catch(Exception $e)
    {   
        echo $e->getMessage();    
    }
?>

<?php
    $filepath = $_FILES["file"]["tmp_name"];
    move_uploaded_file($filepath,"path.json");
?>