Check Valid user using LDAP

The below function will authenticate user using Active Directory.


public bool IsAuthenticated(string domain, string username, string pwd)

{

string _path;

string _filterAttribute;

string servername = "ServerName"; // Give the server Name

string domainAndUsername = domain + "\\" + username;

DirectoryEntry entry = new DirectoryEntry("LDAP://" + servername, domainAndUsername, pwd);

try

{

object obj = entry.NativeObject;

DirectorySearcher search = new DirectorySearcher(entry);

search.Filter = "(SAMAccountName=" + username + ")";

search.PropertiesToLoad.Add("cn");

SearchResult result = search.FindOne();

if (result == null)

{

return false;

}

_path = result.Path;

_filterAttribute = ((string)(result.Properties["cn"][0]));

}

catch (Exception ex)

{

return false;

}

return true;

}

Convert string to byte array and vice-versa

This code sample shows how to convert a string to a byte array and and byte array to string.

//function to convert string to byte array
public static byte[] ConvertStringToByteArray(string stringToConvert)
{
return (new UnicodeEncoding()).GetBytes(stringToConvert);
}

//function to convert byte array to string
public static string ConvertByteArrayToString(byte[] byteArray)
{
return (new UnicodeEncoding()).GetString(byteArray);
}

Random number generator function in c#

Hi All,
Some time we need to generate random sequence of alphanumeric /nemeric/character for password/key etc. Below is static function which takes integer as parameter for the length of the output.

private static string RandomNumberGenerator(int length)
{
RandomNumberGenerator rng = RandomNumberGenerator.Create();
char[] chars = new char[length];
string validChars = "abcdefghijklmnopqrstuvwxyzABCEDFGHIJKLMNOPQRSTUVWXYZ1234567890"; //based on your requirment you can take only alphabets or number
for (int i=0; i< length; i++)
{
byte[] bytes = new byte[1];
rng.GetBytes(bytes);
Random rnd = new Random(bytes[0]);
chars[i] = validChars[rnd.Next(0,61)];
}
return (new string(chars));
}

ASP.NET 2.0 tutorial

Hi All,

Below is the link for asp.net 2.0 tutorial.Its really nice have a look at it

http://msconline.maconstate.edu/tutorials/ASPNET20/default.htm
Happy coding