CS0012: The type 'System.IO.Packaging.Package'

In this article , we will discuss  how to solve the below compilation error:

CS0012: The type 'System.IO.Packaging.Package' is defined in an assembly that is not referenced. You must add a reference to assembly 'WindowsBase, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

The above error occurs when we use the OpenXml Packaging Library.

The Problem

When using OpenXml Packaging Library, .Net framework throws the following compilation error.

 CS0012: The type 'System.IO.Packaging.Package' is defined in an assembly that is not referenced. You must add a reference to assembly 'WindowsBase, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Solutions

We can solve this problem just use below steps:-

Step1:-

We just need to go solution explorer and click the right button of mouse and chose the add reference.

Step2:-

In .Net tab we chose the WindowsBase library 

  

For More:- 

Export Gridview to Excel Sheet in .Net C# ,How to show on time in the gridview in asp.net C# ,How to bind xml with grid view in asp.net c# , How to generate own captcha without DLL in asp.net c#