Medical image visualization using WPF

using System;
using System.Globalization;
using System.Linq;
using System.Xml.Linq;

namespace DICOMViewer.Helper
{
    // The DICOMParserUtility provides easy access of the DICOM attributes via LINQ queries.

    class DICOMParserUtility
    {
        public static string GetDICOMAttributeAsString(XDocument theXDocument, string theAttribute)
        {
            if (theXDocument == null)
                return "???";

            if (theAttribute == null)
                return "???";

            var aQuery = from Element in theXDocument.Descendants("DataElement")
                         where Element.Attribute("Tag").Value.Equals(theAttribute)
                         select Element;

            if (aQuery.Count() > 0)
                return aQuery.Last().Attribute("Data").Value.Trim();

            return "???";
        }

        public static bool DoesDICOMAttributeExist(XDocument theXDocument, string theAttribute)
        {
            if (theXDocument == null)
                return false;

            if (theAttribute == null)
                return false;

            var aQuery = from Element in theXDocument.Descendants("DataElement")
                         where Element.Attribute("Tag").Value.Equals(theAttribute)
                         select Element;

            return (aQuery.Count() > 0);
        }

        public static Int32 GetDICOMAttributeAsInt(XDocument theXDocument, string theAttribute)
        {
            if (theXDocument == null)
                return -1;

            if (theAttribute == null)
                return -1;

            var aQuery = from Element in theXDocument.Descendants("DataElement").First().ElementsAfterSelf()
                         where Element.Attribute("Tag").Value.Equals(theAttribute)
                         select Element;

            if (aQuery.Count() > 0)
            {
                string s = aQuery.Last().Attribute("Data").Value.Trim();
                string[] split = s.Split(new Char[] { '\\' });

                return Convert.ToInt32(split[split.Length - 1], CultureInfo.InvariantCulture);
            }

            return -1;
        }

        public static double GetDICOMAttributeAsDouble(XDocument theXDocument, string theAttribute)
        {
            if (theXDocument == null)
                return -1;

            if (theAttribute == null)
                return -1;

            var aQuery = from Element in theXDocument.Descendants("DataElement").First().ElementsAfterSelf()
                         where Element.Attribute("Tag").Value.Equals(theAttribute)
                         select Element;

            if (aQuery.Count() > 0)
            {
                string s = aQuery.Last().Attribute("Data").Value.Trim();
                string[] split = s.Split(new Char[] { '\\' });

                return Convert.ToDouble(split[split.Length - 1], CultureInfo.InvariantCulture);
            }

            return -1;
        }
    }
}