connectiondidFinishLoading called twice - objective-c

Question

I am new to iphone development. I am able to use the data in connectiondidFinishLoading method.But i see "connection didfinishloading" method called twice.I don't know ,where i am going wrong. Here is my code
Edited code:
again connectionDidFinishLoading called twice
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(textField==CompanyName)
{
autocompleteTableView.hidden = NO;
NSString *substring = [NSString stringWithString:textField.text];
substring = [substring stringByReplacingCharactersInRange:range withString:string];
[self searchAutocompleteEntriesWithSubstring:substring];
return YES;
if([CompanyName.text length]==0)
{
autocompleteTableView.hidden = YES;
[popoverController dismissPopoverAnimated:YES];
}
}
return YES;
}
- (void)searchAutocompleteEntriesWithSubstring:(NSString *)substring
{
data = [[NSMutableData alloc] init];
self.receivedData = data;
[data release];
NSURL *jsonUrl =[NSURL URLWithString:[NSString stringWithFormat:#"http://xxxx=%#",substring]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:jsonUrl];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self ];
//self.connection = connection;a
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
parser = [[NSXMLParser alloc] initWithData:receivedData];
currentHtmlElement=#"5";
[parser setDelegate:self];
[parser setShouldProcessNamespaces:NO];
[parser setShouldReportNamespacePrefixes:NO];
[parser setShouldResolveExternalEntities:NO];
[parser parse];
[parser release];
if([arr4 count]!=0)
{
self.autocompleteUrls = [[[NSMutableArray alloc] init]autorelease];
UIViewController* popoverContent = [[UIViewController alloc] init]; //ViewController
self.autocompleteUrls = [[NSMutableArray alloc] init];
viewForautoCompleteTableView = [[UIView alloc]initWithFrame:CGRectMake (410, 120,270, 250)];
autocompleteTableView = [[UITableView alloc] initWithFrame:CGRectMake(0,0,270,250) style:UITableViewStyleGrouped];
autocompleteTableView.delegate = self;
autocompleteTableView.dataSource = self;
autocompleteTableView.scrollEnabled = YES;
autocompleteTableView.backgroundColor = [UIColor lightTextColor];
autocompleteTableView.rowHeight=28;
autocompleteTableView.backgroundView = nil;
autocompleteTableView.backgroundColor = [UIColor whiteColor];
autocompleteTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
[autocompleteTableView setSeparatorColor:[UIColor orangeColor]];
[viewForautoCompleteTableView setFrame:CGRectMake(210,380 ,autocompleteTableView.frame
.size.width
,autocompleteTableView.frame.size.height)];
[viewForautoCompleteTableView addSubview:autocompleteTableView];
[viewForautoCompleteTableView setBackgroundColor:[UIColor whiteColor]];
CGRect popoverFrame = viewForautoCompleteTableView.frame;
popoverContent.view = viewForautoCompleteTableView;
popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverContent];
popoverController.delegate=self;
[popoverContent release];
[popoverController setPopoverContentSize:CGSizeMake(viewForautoCompleteTableView.frame.size.width, viewForautoCompleteTableView.frame.size.height) animated:NO];
[popoverController presentPopoverFromRect:popoverFrame inView:testscroll permittedArrowDirections:0 animated:YES];
[autocompleteUrls removeAllObjects];
for(int i=0;i<[arr4 count];i++)
{
NSString *curString = [[arr4 objectAtIndex:i] valueForKey:#"Name"];
[autocompleteUrls addObject:curString];
}
}
[autocompleteTableView reloadData];
[connection cancel];
}

Answer 1

you should remove [connection start]; because connection will start automatically after NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:selfstartImmediately:NO];
Edit
a valid NSURLConnection initialization
NSURLRequest *request =[[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#""]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];