private void deleteToolStripMenuItem_Click(object sender, EventArgs e) { DeleteBook deleteBook = new DeleteBook(); deleteBook.FormClosed += UpdateDataGridWhenFormClosed; deleteBook.ShowDialog(); }
private void Delete(object sender, EventArgs e) { FileStream FS = new FileStream("Book.txt", FileMode.Open); string BeDeleted = DeleteBook.Text; byte[] p; bool Found = false; string Temp = ""; while (FS.Position != FS.Length && !Found) { Book book = new Book(); string BookName = ""; book.FieldID_Len = FS.ReadByte(); p = new byte[book.FieldID_Len]; FS.Read(p, 0, book.FieldID_Len); for (int i = 0; i < book.FieldID_Len; i++) { Temp += (char)p[i]; } book.set_FieldID(Temp); FS.Seek(5, SeekOrigin.Current); p = new byte[20]; FS.Read(p, 0, 20); for (int i = 0; i < 20; i++) { BookName += (char)p[i]; } book.set_BookName(BookName); if (BeDeleted.CompareTo(BookName) == 0) { book.BookAuthor_Len = FS.ReadByte(); for (int i = 0; i < book.BookAuthor_Len; i++) { FS.WriteByte((byte)'\0'); } long releas = (book.BookAuthor_Len + 25 + book.FieldID_Len); FS.Seek(-releas, SeekOrigin.Current); for (int i = 0; i < releas; i++) { FS.WriteByte((byte)'\0'); } MessageBox.Show("Record Deleted !! "); Found = true; } else { book.BookAuthor_Len = FS.ReadByte(); FS.Seek(book.BookAuthor_Len, SeekOrigin.Current); } } DeleteBook.Clear(); FS.Close(); }