Best practice to generate bills in C# and SQL

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Hello guys,I m working with WinForms and Database,The forms is about selling items.I want to store each sale with unique number(Bill_no).My idea about bill number is "ddmmyyy0000" 0000 will reset everyday.Can you please help me how can i do this? i also want to show bill number at time of transaction in textbox?
if you have suggestion about bill you are wellcome.

What I have tried:

So far i m getting incremental values from database and and manipulating it Sale Form for next value.But this method is very is very inefficient and disorganized.

Posted 3-Nov-18 2:38am

Danish Kareem

Updated 3-Nov-18 2:53am

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OriginalGriff · Accepted Answer · 2018-11-03T02:54:00

Why? Just use an IDENTITY field (which will autoincrement) and a DATE or DATETIME2 column to store the date - it's a lot more flexible, a lot easier to maintain, and fits better with legal and accounting procedure, neither of which thinks it is a good idea to have "broken sequences" because it's possible to add or remove items / invoices at a later date.

If you really need the date and the daily sequence number, then:
1) Don't do it ddmmyy: make it yyMMdd (or better yyyyMMdd) as they sort better.
2) Use a computed column to generate it from the two other columns (You can get "that day" items easily with a WHERE clause, and the sequence number with the ROW_NUMBER function for the date. Then JOIN that back to your original table.