post xmldata through webservice iphone problem

This is my xml

NSString *Message = [NSString stringWithFormat:                      
                         @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                         "<query>\n"
                         "<IdCategory>1088</IdCategory>\n"
                         "</query>\n"];



NSURL *url = [NSURL URLWithString:@"http://bvd.vndsupport.com/_ws/api/categories/index.asp"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [Message length]];

[theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPMethod:@"POST开发者_开发问答"];
[theRequest setHTTPBody: [Message dataUsingEncoding:NSUTF8StringEncoding]];

NSString *returnString = [[NSString alloc] initWithData:[NSURLConnection sendSynchronousRequest:theRequest returningResponse:nil error:nil] encoding:NSUTF8StringEncoding];
NSLog(@"%@",returnString);

I have simply pass this category id and get the result but returnString always display all category details. I didn't get an exact result. Is this the correct way of passing xml data to webservice?

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go and search for 'wsdl2objc' it does it all for you if you wanted to do soap requests.

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This code will work perfectly. the problem is webservice page