IPhone : How to convert data string to json object and string in ios?

how to convert string to json object or json array in ios? my json string Like That.

{"Data": [{"ID":"1","Name":"Raj"},{"ID":"2","Name":"Rajneesh"}]}

i want to get ID or Name from this string please help me if anyone now this.

Thank You.

I try below code but print null

  NSString *JsonString=@"{"Data": [{"ID":"1","Name":"Raj"},{"ID":"2","Name":"Rajneesh"}]}";
    NSData *objectData = [JsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData options:0 error:&error];
    NSArray* array = [json objectForKey:@"Data"];
    NSLog(@"Print Array %@",array);