Sharepoint 2010 Claims site - Add FBA users to Sharepoint group programmatically

Adding FBA users to Sharepoint group programmatically is simple. The hunch is the format "i:0#.f|fbamembershipprovider|" + username

In the format, 
i  - stands for Identity provider 
f  - stands for fba authentication
fbamembershipprovider  - is my providername

Here you go, a simple sample that servers the pupose.

SPSite sitename = new SPSite("SiteURL");

        SPWeb spWeb = sitename.OpenWeb();

        

        String strusername= "i:0#.f|fbamembershipprovider|" + UsernameTextbox.Text;

        spWeb.AllUsers.Add[strusername, EmailTextbox.Text, UsernameTextbox.Text, strusername];

       

         

            if (spUser != null)

            {

                SPGroup spGroup = spWeb.Groups["GROUP_NAME"];

            if (spGroup != null)

            spGroup.AddUser(spUser);

            }

Happy Coding :)