Dalam sistem informasi data merupkan prioritas pertama, sehingga desain aplikasi sudah diatur untuk meminimalisir kemungkinan terjadi kehilangan data akibat hal hal yang tidak diduga, seperti tidak sengaja melakukan klik pada button hapus, button exit sebelum disimpan dan sebagainya. Salah satu cara yang dapat digunakan untuk mencegah terjadinya kecelakaan-kecelakaan yang disebabkan oleh user adalah memberi jendela dialog/jendela konfirmasi pada aplikasi, sehingga jika user tidak sengaja menekan tombol close, program tidak langsung diterminate, melainkan menunggu konfirmasi dari user apakah memang benar ingin keluar dari program. Pada tutorial kali ini dibahas bagaiaman cara membuat kotak dialog konfirmasi jika user melakukan klik pada button close (button yang ada di pojok kanan atas dari aplikasi). Seperti biasa siapkan project kosong terlebih dahulu klik file new project pada IDE Visual Studio, muncul kotak dialog project save, ketik nama project sesuai keinginan dan klik OK. Setelah project sudah disiapkan ikuti langkah demi langkah berikut ini
Gambar 1 Desain Aplikasi
langkah pertama : double klik pada form yang telah terbentuk untuk masuk kejendela source code, cari baris code seperti berikut
Modifikasi source code diatas sehingga menjadi seperti berikut ini
Modifikasi source code diatas sehingga menjadi seperti berikut ini
langkah 2 : buat fucntion untuk menangkap kejadian yang telah didefinisikan diatas, modifikasi source diatas bertujuan untuk menambahkan event closing pada form. Berikut ini potongan source function untuk menangkap jika button x pojok kanan atas pada program ditekan
Saat pertamakali dijalankan
Gambar 2. Preview runing program
Setelah button x yang teletak di pojok kanan atas diklik hasilnya seperti pada gambar berikut ini
Gambar 3. Preview runnig program
Download binary file disini
Download full project disini
Contact Us On informasi@csharp-indonesia.com
NB : Dalam tutorial ini program ditulisa menggunakan IDE Visual studio 2010. dengan target framework 2.0 . Sehingga minimal komputer harus terinstal windows xp untuk bisa menjalankan program *.exe nya, Sedangkan untuk membuka projectnya mau tidak mau harus menginstal microsoft visual studio 2010
Hmm, sebagai tambahan saja, even closing dan formclosed tidak berjalan ketika Dispose() dipanggil. Jadi untuk menutup form dengan cara lain (misal tombol exit), gunakan Close() dan bukan Dispose()
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