public bool Save_New_Book(Book_Tab_Model obj)
        {
            string sql = "INSERT INTO [dbo].Books VALUES ('"+obj.BName+"', '"+obj.Authors+"', '"+obj.CID+"', '"+obj.Info+"', '"+obj.PID+"', '"+obj.Total_Copies+"', '"+obj.Total_Copies+"')";

            SqlCommand cmd = sqlconnection(sql);
            cmd.ExecuteNonQuery();

            return true;
        }
        public bool Save_New_Book(Book_Tab_Model obj)
        {
            string sql = "INSERT INTO [dbo].Books VALUES ('" + obj.BName + "', '" + obj.Authors + "', '" + obj.CID + "', '" + obj.Info + "', '" + obj.PID + "', '" + obj.Total_Copies + "', '" + obj.Total_Copies + "')";

            SqlCommand cmd = sqlconnection(sql);

            cmd.ExecuteNonQuery();

            return(true);
        }