Microsoft.Reporting does not exist in namespace

You need to install Microsoft Report Viewer to have its assemblies available in Visual Studio. You can bring it from: http://www.microsoft.com/en-us/download/details.aspx?id=6442

You must right-click on References folder in your project and click on Add Reference. and then go to Assemblies > Extensions > Microsoft.ReportViewer and add it to your references.

Search for "reportviewer" in Nuget. Install the Microsoft.ReportViewer.WebForms VS2010 package.