If you have a assembly with the same version number located both in the bin folder for a web site and in the Global Assembly Cache (GAC), ASP.NET will by default use the GAC version of the file. Sometimes that’s not the ideal solution so here’s a workaround.
1. Open web.config in a text editor
2. Add this code to /configuration/runtime/assemblyBinding/dependentAssembly:
<assemblyIdentity name="Your.Assembly.Name" publicKeyToken="31bf3856ad364e35"/> <codebase version="1.0.0.0" href="/bin/Your.Assembly.Name.dll" />