I started by installing the YUICompressor .NET (MsBuild Task) package from Nuget gallary in my VS2010 web project.
Download the Sample WebSite using Post-Build events. Copy the MSBuild folder to your project root.
Open MSBuildSettings.xml (inside the MSBuild folder in your project) and modify the element UsingTask‘s attribute AssemblyFile to AssemblyFile="(root folder for your solution)\packages\YUICompressor.NET-MsBuild-Task.188.8.131.52\lib\NET35\Yahoo.Yui.Compressor.MsBuildTask.dll". Also modify the path and the final file name for CSS and JS output. Click the image below to see the code.
Finally, modify the web project Build settings. Please take note of
$(TargetDir) <– you might wish to change this if you have another destination directory.
You can copy the post-build event script from below,
Good luck trying.