SharePoint Online Authentication.cs

public static SharePointOnlineCredentials GetO365Credentials(string userName, string passWord) 
{ 
    SecureString securePassWord = new SecureString();
    foreach (char c in passWord.ToCharArray())
    {
        securePassWord.AppendChar(c);
    }
    SharePointOnlineCredentials credentials = new SharePointOnlineCredentials(userName, securePassWord); 
    return credentials; 
}