Enigma Protector

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public Form1()
        {
            InitializeComponent();
            for (int i = 1; i <= 3; i++)
            {
                int len = Enigma_IDE.EP_ProtectedStringByID(i, null, 0);
                if (len > 0)
                {
                    StringBuilder str = new StringBuilder(len);
                    if (Enigma_IDE.EP_ProtectedStringByID(i, str, len) > 0)
                    {
                        if (i == 1)
                            encdecpass = str.ToString();
                        if (File.Exists(Directory.GetCurrentDirectory() + "\\users.ini") == false)
                        {
                            File.Create(Directory.GetCurrentDirectory() + "\\users.ini");
                            IniFile ini = new IniFile(Directory.GetCurrentDirectory() + "\\users.ini");
                            if (i == 2)
                                username = str.ToString();
                            else
                                password = str.ToString();
                        }
                    }
                }
            }
        }

        public class Enigma_IDE
        {
            [DllImport("enigma_ide.dll", CallingConvention = CallingConvention.StdCall)]
            public static extern Int32 EP_ProtectedStringByID(Int32 ID, StringBuilder Str, Int32 Len);
        }

Code: Select all

Error	1	The type or namespace name 'DllImport' could not be found (are you missing a using directive or an assembly reference?)	C:\******\Visual Studio 2010\Projects\login\login\Form1.cs	47	14	login
Error	2	The type or namespace name 'DllImportAttribute' could not be found (are you missing a using directive or an assembly reference?)	C:\******\Visual Studio 2010\Projects\login\login\Form1.cs	47	14	login