How to Read a Text File (with a single call to sReader.ReadToEnd())

public static string getFileAsString(string fileName) {
StreamReader sReader = null;
string contents = null;
try {
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
sReader = new StreamReader(fileStream);
contents = sReader.ReadToEnd();
} finally {
if(sReader != null) {
sReader.Close();
}
}
return contents;
}