tailieunhanh - Lập trình C# - Code đăng nhập

using System; using ; using ; using ; using ; using ; using ; using ; | Lập trình C# - Code đăng nhập using System; using ; using ; using ; using ; using ; using ; using ; namespace BAIBACCAO { public partial class notepad : Form { public notepad() { InitializeComponent(); } String filename = ""; private void deleteToolStripMenuItem_Click(object sender, EventArgs e) { (); } private void newToolStripMenuItem_Click(object sender, EventArgs e) { = ""; = "Untitled"; filename = ""; } private void openToolStripMenuItem_Click(object sender, EventArgs e) { = "Text Files (*.txt)|*.txt|Word Documents" + "(*.doc)|*.doc|All Files (*.*)| *.*"; try { if (() == ) { filename = ; = filename; StreamReader strReader;// bien dung de doc du lieu ra strReader = (filename); = (); (); } } catch { ("Lỗi chương trình ?"); } } private void saveToolStripMenuItem_Click(object sender, EventArgs e) { if (filename == "") { = "Text Files (*.txt)|*.txt|Word Documents" + "(*.doc)|*.doc|All Files (*.*)| *.*"; = "Untitled"; if (() == ) { //'Luu noi dung filename = ; FileStream fStream;//chua ten moi StreamWriter strWriter;//dung doc fStream = (filename); (); strWriter = (filename); (); (); = filename; } } else { //'Luu noi dung FileStream fStream; StreamWriter strWriter; fStream = (filename); (); .