Add a user to a custom group in SharePoint Group - A Function to serve the purpose

How do i add a user to a group using SharePoint Object Model.

The following function will help you to achieve this...

1. Get the loginname of the user and pass it to the following function
2. the following code adds the user to the Sharepoint Group called MYSite_MyGroup1.

public void AddUser(strloginName)
{
if (!string.IsNullOrEmpty(strloginName))
 {                                                                //Gets the Collection of Site Groups
                                SPGroupCollection objSPSiteGroups = objSPWeb.SiteGroups;
                               string  strCustomGroupName = "MYSite_MyGroup1";
                                if (objSPSiteGroups != null && !string.IsNullOrEmpty(strloginName))
                                {                                                                     
                                        // Adds the new user to the MYSite_MyGroup1 group
                                        objSPgpUserGroup = objSPWeb.SiteGroups[strCustomGroupName];

     // Make sure that the user is added to site . the following built in method makes sure it is added to the site
                                        objnewUser = objSPWeb.EnsureUser(strloginName);                                    


              //Add the user to group                         
                                        objSPgpUserGroup.AddUser(objnewUser);
                                        objSPgpUserGroup.Update();                                 
                                   

                                 }
 }
}


And thats it...