iOS/iPhone NSURLConnection POST Method and Send Parameter (Objective-C)

    //Name=Weerachai&Surname=Nukitram"
    NSMutableString *post = [NSString stringWithFormat:@"Name=%@&Surname=%@",[txtName text],[txtSurname text]];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    
    NSURL *url = [NSURL URLWithString:@"https://www.thaicreate.com/url/post.php"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                       cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                       timeoutInterval:10.0];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
	[request setHTTPBody:postData];
    
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];

NSMutableString *post = [NSString stringWithFormat:@"Name=%@",[txtName text]];

NSMutableString *post = [NSString stringWithFormat:@"Name=%@&Surname=%@",[txtName text],[txtSurname text]];

<?php
echo "Sawatdee Khun ".$_POST["Name"]." ".$_POST["Surname"];
?>

//
//  ViewController.h
//  NSURLConnectionApp
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    
    IBOutlet UIActivityIndicatorView *loading;
    
    IBOutlet UITextField *txtName;
    
    IBOutlet UITextField *txtSurname;
    
    IBOutlet UILabel *lblResult;
}

- (IBAction)btnSubmit:(id)sender;

@property(nonatomic,assign) NSMutableData *receivedData;

@end

//
//  ViewController.m
//  NSURLConnectionApp
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize receivedData;


- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    [loading setHidden:TRUE];
}
- (IBAction)btnSubmit:(id)sender {
    
    [loading setHidden:FALSE];
    
    //Name=Weerachai&Surname=Nukitram"
    NSMutableString *post = [NSString stringWithFormat:@"Name=%@&Surname=%@",[txtName text],[txtSurname text]];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    
    NSURL *url = [NSURL URLWithString:@"https://www.thaicreate.com/url/post.php"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                             cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                             timeoutInterval:10.0];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
	[request setHTTPBody:postData];
    
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
    
    [loading startAnimating];
    
    if (theConnection) {
        self.receivedData = nil;
    } else {
		UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Failed in viewDidLoad"  delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
		[connectFailMessage show];
		[connectFailMessage release];
    }
    
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    receivedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    sleep(5);
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    
    [connection release];
    [receivedData release];
    
    // inform the user
    UIAlertView *didFailWithErrorMessage = [[UIAlertView alloc] initWithTitle: @"NSURLConnection " message: @"didFailWithError"  delegate: self cancelButtonTitle: @"Ok" otherButtonTitles: nil];
    [didFailWithErrorMessage show];
    [didFailWithErrorMessage release];
	
    //inform the user
    NSLog(@"Connection failed! Error - %@", [error localizedDescription]);
    
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    if(receivedData)
    {
        NSLog(@"%@",receivedData);
        
        NSString *dataString = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding];

        NSLog(@"%@",dataString);
        lblResult.text = dataString;
        
        [loading stopAnimating];
        [loading setHidden:TRUE];
    }
    
                                                 
    // release the connection, and the data object
    [connection release];
    [receivedData release];
}
                                                 
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)dealloc {
    [loading release];
    [txtName release];
    [txtSurname release];
    [lblResult release];
    [super dealloc];
}

@end