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();
}
