Check login user exists in sharepoint site?

Question

We are creating mobile app for SharePoint 2010 site.when mobile user enter user name and password .How i check that user exsists in AD or not .

Answer 1

You can use System.DirectoryServices.AccountManagement namespace, following should help:

// create a "principal context" - e.g. your domain (could be machine, too)
using(PrincipalContext pc = new PrincipalContext(ContextType.Domain, "YOURDOMAIN"))
{
    // validate the credentials
    bool isValid = pc.ValidateCredentials("myuser", "mypassword");
}

PS: It has nothing to do with SharePoint, but you can use it in SharePoint.. You might need to put the code in RunWithElevatedPrivileges