[c#] The CodeDom provider type "Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider" could not be located

just uninstall the package from package manager console from command below

PM> Uninstall-package Microsoft.CodeDom.Providers.DotNetCompilerPlatform

PM> Uninstall-package Microsoft.Net.Compilers

and then install it again from nuget manager enter image description here

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