WinForm : Application built using .net Framework 1.1

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I have one application built using .Net Framework 1.1 and .net framework 4.0 already installed on client machine so does microsoft provides backward compatibility or do i still need to install .net Framewok 1.1 on client machine

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The .NET Framework 4 is backward-compatible with applications that were built with the .NET Framework versions 1.1, 2.0, 3.0, and 3.5. In other words, applications and components built with previous versions of the .NET Framework will work on the .NET Framework 4.

Source: https://msdn.microsoft.com/en-us/library/ff602939(v=vs.100).aspx

Edit: You must check the migration issues and changes that might affect your application.