Hide records in app(ASP.NET)

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i have two tables.. A parent table...(Primary key) Category(CategoryId,CategoryName) and child table ..(Foreign key) Item(ItemId,ItemName,ItemCode,CategoryId)..having relationship between them..
when i delete records from application through a button click ...than record...should not be deleted...but should be hidden from application...and should be present in database table...and if i search the record from a textbox ...with the text changed event it should not be seen to the user...and also when a user tries to add data on the same hidden record ItemId...there should be a message ..that you cannot insert duplicate records....waiting for..your reply... thanks in advance....i have searched a lot but...nothing comes..handy....

What I have tried:

i worked with dml operation ...but this kind of situation iam facing for first time

Posted 7-Aug-16 19:54pm

Member 12674660

Updated 8-Aug-16 1:07am

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njammy 8-Aug-16 5:39am

Please update your question with HTML markup, button events and code behind you have already got and I will help with this further detail.

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njammy · Answer 1 · 2016-08-08T01:07:00

1. I would expect a data base table column flag for the deleted record, set this bit type e.g. deleted record value for this field = 1.

2. Your database query should exclude where deleted = 1 and thus only return "visible" non-deleted data.
e.g. MS SQL:
select * from table1 where not (deleted = 1)

3. On insert, first do query to check if the record exists using record parameters including deleted = 1
e.g. in MS SQL:

SQL

if not exists (select * from table1 where col1 = @col1 and col2 = @col2 etc...)
begin
  insert into table 1 @col1, @col2 etc...
end
else
begin
  update table1 set deleted = 0 where col1 = @col1 and col2 = @col2 etc...
end