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See below for all the code:

WebServiceHelper.h

#import <UIKit/UIKit.h>


@interface WebServiceHelper : NSObject {

	
}

+(NSURLRequest *) generateWebServiceURLRequest : (NSString *) url: (NSString *) methodName: (NSArray *) keys: (NSArray *) objects;
+(NSURL *) generateWebServiceHTTPGetURL : (NSString *) url: (NSString *) methodName: (NSArray *) keys: (NSArray *) objects;

@end

WebServiceHelper.m

#import "WebServiceHelper.h"


@implementation WebServiceHelper



/*
 url - string url of web service (including .asmx)
 methodName - string methodname(operation) of webservice
 keys = parameters of web service
 objects = values of each parameter in web service
 
 example:
 
 
 NSArray *keys = [NSArray arrayWithObjects:@"USZip", nil];
 NSArray *keyvalues = [NSArray arrayWithObjects:@"11235", nil];
 
 
 [self generateWebServiceURLRequest: @"http://www.mywebsite.com/mywebservice.asmx" : @"getMyData": keys: keyvalues]
 
 */
+(NSURLRequest *) generateWebServiceURLRequest : (NSString *) url: (NSString *) methodName: (NSArray *) keys: (NSArray *) objects
{
	NSDictionary *params = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
	
	NSString *newMethodName;
	
	// We need to start the methodName with a / - since we are using GET Request method
	newMethodName = @"/";
	newMethodName = [newMethodName stringByAppendingString: methodName];
		
	url=[url stringByAppendingString:newMethodName];
		
	BOOL firstKey=TRUE;
	for (NSString *key in params)
	{
		NSString *value=[params objectForKey:key];
		if (firstKey) url=[url stringByAppendingString:@"?"]; else url=[url stringByAppendingString:@"&"];
		url=[url stringByAppendingString:key];
		url=[url stringByAppendingString:@"="];
		url=[url stringByAppendingString:value];
		firstKey=FALSE;
	}
	
	NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:url]
											  cachePolicy:NSURLRequestUseProtocolCachePolicy
										  timeoutInterval:60.0];
	
	return theRequest;
}


+(NSURL *) generateWebServiceHTTPGetURL : (NSString *) url: (NSString *) methodName: (NSArray *) keys: (NSArray *) objects
{
	NSDictionary *params = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
	
	NSString *newMethodName;
	
	NSURL *resultURL;
	
	// We need to start the methodName with a / - since we are using GET Request method
	newMethodName = @"/";
	newMethodName = [newMethodName stringByAppendingString: methodName];
	
	NSLog(@"generateWebServiceHTTPGetURL: newMethodName: %@",newMethodName);
	
	url=[url stringByAppendingString:newMethodName];
	
	BOOL firstKey=TRUE;
	for (NSString *key in params)
	{
		NSString *value=[params objectForKey:key];
		if (firstKey) url=[url stringByAppendingString:@"?"]; else url=[url stringByAppendingString:@"&"];
		url=[url stringByAppendingString:key];
		url=[url stringByAppendingString:@"="];
		url=[url stringByAppendingString:value];
		firstKey=FALSE;
	}
	
	NSLog(@"generateWebServiceHTTPGetURL: URL: %@",(NSString *)url);
	
	resultURL = [NSURL URLWithString:url];
		
	return resultURL;
}

@end

MyViewController.h (obviously any view controller)

#import <UIKit/UIKit.h>


@interface MyViewController : UIViewController {
	
	IBOutlet UILabel *lblUserName;
	IBOutlet UILabel *lblPW;

}


@property (nonatomic, retain) UILabel *lblUserName;
@property (nonatomic, retain) UILabel *lblPW;


-(IBAction) callMyWebService: (id) sender;

@end

MyViewController.m

#import "myViewController.h"

@implementation myViewController

@synthesize lblUserName, lblPW;

-(IBAction) callMyWebService: (id) sender {


NSURL *theURL;
	

	NSArray *keys = [NSArray arrayWithObjects:@"userName",@"passWord", nil];
	NSArray *keyvalues = [NSArray arrayWithObjects:lblUserName.text,lblPW.text, nil];	
	

	
	theURL = [WebServiceHelper generateWebServiceHTTPGetURL: @"http://www.mywebsite.com/mywebservice.asmx": @"mywebservicemethod": keys: keyvalues];
	

// The rest of the code you will have to use NSXMLParser to parse the WS XML

}

I hope the above will help you... maybe some syntax errors... wrote it by hand....

Good luck....