protected void gv_books_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string bid = (gv_books.Rows[e.RowIndex].FindControl("lbl_bid") as Label).Text;
string bname = (gv_books.Rows[e.RowIndex].FindControl("txt_bname") as TextBox).Text;
string bauthor = (gv_books.Rows[e.RowIndex].FindControl("txt_bAuthor") as TextBox).Text;
string btitle = (gv_books.Rows[e.RowIndex].FindControl("txt_bTitle") as TextBox).Text;
string bprice = (gv_books.Rows[e.RowIndex].FindControl("txt_bPrice") as TextBox).Text;
string bpages = (gv_books.Rows[e.RowIndex].FindControl("txt_bNoofPages") as TextBox).Text;
FileUpload bimage = (gv_books.Rows[e.RowIndex].FindControl("txt_bimg") as FileUpload);
string address = "~/Images/" + Guid.NewGuid() + ".jpg";
bimage.SaveAs(Server.MapPath(address));
LibraryDAL dal = new LibraryDAL();
dal.Update(Convert.ToInt32(bid), bname, bauthor, btitle, Convert.ToInt32(bprice), Convert.ToInt32(bpages), address);
gv_books.EditIndex = -1;
List <BookModel> list = dal.Search(txt_search.Text);
gv_books.DataSource = list;
gv_books.DataBind();
lbl_msg.Text = "Updated Successfully...";
}