Authenticate against ActiveDirectory

Question

I did a little Googling and I came accross this promising code

System.DirectoryServices.AccountManagement.PrincipalContext pc = new System.DirectoryServices.AccountManagement.PrincipalContext(ContextType.Domain, "YOURDOMAIN")
// validate the credentials 
bool validatedOnDomain = pc.ValidateCredentials(userName, tb.Text.ToString());

userName is initialized as the Windows login name. It's also a string tb.Text.ToString() is the textbox that is being used for typing the password

Updated code and it's working. Thanks all

MSDN says that PrincipalContext can use two arguments

Answer 1

Try to figure out this code.. This is working perfectly in my project.

public bool  ValidateUser(string varDomain, string varUserName, string varPwd)
    {
        Boolean isValidUser;
        using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, varDomain))
        {
            isValidUser = pc.ValidateCredentials(varUserName, varPwd);
        }
        return isValidUser;

    }

Answer 2

type used in a using statement must be implicitly convertible to 'System.IDisposable'

Means that you need to change your code to:

PrincipalContext pc = new PrincipalContext(ContextType.Domain, "YOURDOMAIN");

// validate the credentials 
bool validatedOnDomain = pc.ValidateCredentials(userName, tb.Text.ToString());

Basically it's just telling you that you cannot use a PrincipalContext in a using statement, because PrincipalContext does not implement the interface called IDisposable.

EDIT As marc_s has pointed out below, the PrincipalContext you are using is not the right one. It seems to live in your own namespace. You should be using that from System.DirectoryServices.AccountManagement.