title: How to uninstall nuget and clear corrupted entries?
body: <p>I want to install AjaxControlToolkit via nuget. But NuGet Package Manager GUI displays error as show below.</p>
  <p><img src="https://i.stack.imgur.com/ncyI8.png" alt="enter image description here" /></p>
  <p>Even when I try to install a fresh copy of AjaxControlToolkit, NuGet displays message:</p>
  <p>Failed to install or uninstall nuget package.</p>
  <p>I checked my project and didn't find any nuget file. Where are the corrupted entries and how to repair it?</p>