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Error: The given key was not present in the dictionary in C# Asp.Net Core when getting an item from a list or dictionary
How to install and uninstall window service in .Net Framework version 4.5 by using the command in Window Server 8 R2.
System.InvalidOperationException: 'Collection was modified; enumeration operation may not execute.'
How to convert sublists to a flat list using LINQ in C#? I try use Select() LinQ but it is not working for me.