i have to add annotation pin on location with UIslider Value change .... this is code where i add annotation

• (MKAnnotationView *) mapView:(MKMapView *)mapView1 viewForAnnotation:(id ) annotation{

  MKAnnotationView* annotationView = nil; NSString* identifier = @"Pin"; MyAnnotationView* annView = (MyAnnotationView*)[mapView1 dequeueReusableAnnotationViewWithIdentifier:identifier]; // annotationView.leftCalloutAccessoryView = myImage; //myImage = [UIButton buttonWithType:UIButtonTypeCustom]; // [myImage setImage:[UIImage imageNamed:@"mark.png"]forState:UIControlStateNormal];

  //Property_Photo UIButton *mybtn = [UIButton buttonWithType:UIButtonTypeCustom]; if([annotation isKindOfClass:[AddressAnnotation class]]){ AddressAnnotation x=(AddressAnnotation)annotation;

  mybtn.frame = CGRectMake(0, 0, 35, 35);
  mybtn.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
  mybtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;   
  [mybtn setImage:[UIImage imageNamed:@"btn.png"] forState:UIControlStateNormal];
  [mybtn setTitle:[NSString stringWithFormat:@"%@",[x getID]] forState:UIControlStateDisabled];
  
  
  [mybtn addTarget:self action:@selector(btnShowProperty:) forControlEvents:UIControlEventTouchUpInside];
  ((IMOVEISAppDelegate*)[[UIApplication sharedApplication]delegate]).strPropertyPrice = [[myTblArray objectAtIndex:imgIndex]valueForKey:@"Property_Price"];   
  NSLog(@"property price: %@",((IMOVEISAppDelegate*)[[UIApplication sharedApplication]delegate]).strPropertyPrice);
  
  
  if(nil == annView) {
      ///if(annView!=nil && [annView retainCount]>0){ [annView release]; annView=nil; }
  
  
  annView = [[[MyAnnotationView alloc] initWithAnnotation:x reuseIdentifier:identifier] autorelease];
  
  
  if(Objslider.value==10){
  
  
      [myMapView removeAnnotations:myMapView.annotations];
  
  
  }
  
  
  }
  
  
  NSURL *imgURL = [NSURL URLWithString:[[myTblArray objectAtIndex:imgIndex]valueForKey:@"Property_Photo"]];
  UIImage *imgPhoto = [UIImage imageWithData:[NSData dataWithContentsOfURL:imgURL]];
  UIImageView *pinImgView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0,35, 35)];
  imgIndex++;
  [pinImgView setImage:imgPhoto];
  annView.rightCalloutAccessoryView = mybtn;
  annView.leftCalloutAccessoryView = pinImgView;
  [annView setBackgroundColor:[UIColor clearColor]];  
  

  } [annView setEnabled:YES];
  annView.canShowCallout = YES; annView.calloutOffset = CGPointMake(-5, 5);

  annotationView = annView; return annotationView; }