C# : Periodically seeing the ASP.NET error CS0656: Missing compiler required member

C# : Periodically seeing the ASP.NET error CS0656: Missing compiler required member
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Next, enter the letters 'awesome' on your keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

A quick introduction about me,
Greetings, my name is Delphi.
I help you answer your questions.
C# : Periodically seeing the ASP.NET error CS0656: Missing compiler required member
If you have specific questions that need answers, please don't hesitate to comment or chat with me.
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compiler error the member C# seeing Missing : required CS0656: ASP.NET Periodically