C# Compiler Error – CS0509 ‘{0}’: cannot derive from sealed type ‘{

AbundantCode 1 week ago in C# 0

In this blog post, you’ll learn more about the C# Compiler Error – CS0509 and the related message description

C# Compiler Error Code

CS0509

C# Compiler Description for the Code :CS0509

‘{0}’: cannot derive from sealed type ‘{1}’

Tags : C# Errors