Create Custom Attribute in .net

/* class to create custom attribute .The custom attribute class must be inherited from Attribute which is an abstract class
*/
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication1
{
[AttributeUsage(AttributeTargets.All,Inherited=true,AllowMultiple=true)]
class AuthorAttribute:Attribute
{
private string authorFirstName = string.Empty;
private string authorLasttName = string.Empty;
private string authorCreationDate = string.Empty;
public AuthorAttribute(string firstName, string lastName)
{
this.authorFirstName = firstName;
this.authorLasttName = lastName;
}
public AuthorAttribute(string firstName, string lastName,string creationDate)
{
this.authorFirstName = firstName;
this.authorLasttName = lastName;
this.authorCreationDate = creationDate;
}
public string AuthorName
{
get
{
return (this.authorFirstName + " " + authorLasttName);
}
}

public string CreationDate
{
get
{
return (this.authorCreationDate);
}
}

}
}

//Implement Custom Attribute

using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication1
{
[Author("Nitendra Singh","raghuwanshi","25/11/2008")]
class Program
{
static void Main(string[] args)
{
Program pr = new Program();
DisplayAttributes(pr.GetType());
Console.ReadLine();
}
static void DisplayAttributes(Type type)
{
AuthorAttribute author = null;
foreach (object objAttribute in type.GetCustomAttributes(false))
{
author = objAttribute as AuthorAttribute;
if (author == null)
continue;
Console.WriteLine("Name :" + author.AuthorName);
Console.WriteLine("Date :" + author.CreationDate);
}
}
}
}

Sorting Array of Strings Alphabetically without using inbuilt dotnet methods

//Main function to print sorted array
static void Main(string[] args)
{
Program pr = new Program();

//Array of element.
string[] array = { "nitendra","abhijit","nsr","manish","rahul","zaheer","abhishek","msdfDS","xyz","123"};
pr.sort(array);
for (int i = 0; i <= array.Length-1 ; i++)
{
Console.WriteLine(array[i]);
}
}

//Function to compare two strings

public int Compare(string str1, String str2)
{
int len1, len2, i;
len1 = str1.Length;
len2 = str1.Length;
for (i = 0; i < len1 && i < len2; i++)
{
if (str1[i] < str2[i])
return -1;
else if (str1[i] > str2[i])
return 1;
}
return 0;
}

//Function to sort array of strings

public void sort(String[] array)
{
int i, j;
String temp;
int sortTheStrings = array.Length-1;
for (i = 0; i < sortTheStrings; ++i)
for (j = 0; j < sortTheStrings; ++j)
if (Compare(array[j],(array[j + 1])) > 0)
{
temp = array[j];
array[j] = array[j + 1];
array[j + 1] = temp;
}
}