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I working on desktop application windows desktop made by csharp I make license file have period of license as 30 day and start date and computer mac address my issue is clients delete license file so desktop app start as first day after delete this file so how to prevent users from delete...

I work on web api with asp.net core 3.1 I use singelton pattern on my web app so my question is on singlton pattern objects are the same for every object and every request so How to handle multithread on singleton pattern ?

I work on windows desktop application using c# I need to sell my app so I need to protect him using license for 30 day then after that client can't use my app as trial version so what best technology or technique that can do that as free library ? What I have tried: I stored key and value...

I work on c# windows desktop application on POS Form for pharmacy I need to read barcode to datagridview for every item AND when read another item again go to next line for every reading barcode so are there are any sample for pos form with datagridview on GitHub or any web site so i can't...

Problem Error display in linq query "specific cast is not valid" at System.Data.DataRowExtensions.UnboxT`1.ValueField(Object value) at System.Data.DataRowExtensions.Field[T](DataRow row, String columnName) LinqQuery give error var query1 = (from x in table1.AsEnumerable()...

I make many to many relationship in erd diagram in sql server 2005 between ca and driver as following car table driver table car_driver table. I need to make fleet management program. When I make forms in windows form are i make car form driver form car_driver form When i insert data are...