Active Directory Authentication from ASP .NET

Any ASP.Net application which requires authenticating a user from Active directory would required LDAP (Lightweight Directory Access protocol).

To achieve this you would require the following.

1. Add the below two namespaces.

using System.DirectoryServices;

using System.DirectoryServices.ActiveDirectory;

2. Use the below function to authenticate the user with Active directory.

public static bool AuthenticateWithAD(string activeDirectoryServer, string userName,string password)
{
bool authentic = false;
try
{
DirectoryEntry entry = new DirectoryEntry(activeDirectoryServer, userName, password);
object nativeObject = entry.NativeObject;
authentic = true;
}

catch (DirectoryServicesCOMException)
{
return false;
}

catch (Exception ex)
{
return false;
}
return authentic;
}

//Below lines

AuthenticateWithAD("LDAP://spserver","username","password");

This does fantastic, I hope it will help you a lot when doing forms authenticate with AD.

Thanks