c# HashSet List Error

Hello I have over 10 years of experience with C# and Microsoft .NET Framework Could you send more details about error? Screenshot,. etc? Thanks

• 20+ years’ experience Software Development - Since 1997 • 15+ years’ experience C#/.NET software development - Since 2004 • 17+ years’ experience ASP.NET Web Form ASPX - Since 2002 • 5+ years’ experience ASP.NET MVC , ASP.NET CORE ,LINQ , EF , SQL, Python - Since 2014 • 3+ years’ experience AngularJS 1.7 - Start Since 2016 • 2+ years’ experience AngularCLI 7-8 - Since 2017 • 18+ years’ experience PHP/MySQL - Since 2000 • 8+ years’ experience App development Android, iOS Xamarin and Java Platform - Since 2011 • 3+ years’ experience Cryptocurrency and Ethereum smart contract development - Since 2017 • 5+ years’ experience UI/UX Design and graphic Design Photoshop, Adobe XD - Since 2015 • 20+ years’ experience C, C++, Pascal, QBasic , FoxPro, dos programming - Since 1998 • 2+ years’ experience Web Scrap and undefined data parsing - Since 2016 • 20+ years’ experience web technologies like HTML5, CSS3, Bootstrap, JavaScript - Since 1999 • 19+ years’ experience Graphic Design Logo , Printing , Branding , banner - Since 2000 • 15+ years’ experience Animation design Flash + Actionscript 2/3 - Since 2005 • 1+ Vue • Fluency in English;

hi sir I am interested in your project. want to provide my best for your task. myself 6 year experienced developer. my aim is only to satisfied emoyer with quality. you can check my reviews for assurance. please ping me for discussion

Hi Please send me the error detail and also send me the whole project or source code, so I can debug and fix it. Thank You!

✅ Language : ----- C++, C#, Qt, Python, Java, VB/VBA, Matlab, R, delphi, JS, PHP ----- ✅ Skill : High and low desktop application Network communication(TCP/IP, UDP, RTSP/RTP, HTTP, SMTP...) Database(MySQL, Access, Excel, Oracle, MSSQL...) Computer security & Encrypt/Decrypt(DES...) MetaTrading, WebScrapping Project reversing, Multi-threading, System management Image processing(OpenCV, OpenGL...) Video codec processing(H264/265, ffmpeg, Mpeg4, YUY2...) ✅ Platform : Windows, Mac, Ubuntu

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