NPOI is an open-source .NET library that allows you to read and write Microsoft Office file formats. NPOI is built on top of the Apache POI project, a Java library for working with Office files. NPOI provides a similar set of features as the Apache POI library but is explicitly designed for use with .NET and C#.
To install NPOI in c#, follow these steps:
Step 1: Install the .NET Framework and Visual Studio, if you do not already have them. You can download and install the .NET Framework from the Microsoft website (https://dotnet.microsoft.com/download) and download and install Visual Studio from the Visual Studio website (https://visualstudio.microsoft.com/downloads/).
.NET Framework looks like this.
Visual Studio looks like this.
Step 2: Open Visual Studio and create a new project. In the New Project dialog, select the “Class Library” project template, give the project a name, and click “OK”.
Step 3: In Solution Explorer, right-click on the project and select “Manage NuGet Packages”.
Step 4: In the NuGet Package Manager, click on the “Browse” tab and search for “NPOI”. Select the “NPOI” package and click “Install” to install it.
Step 5: Once the installation is complete, you can use NPOI in your C# code by adding the following using statement:
Step 6: You can now use the classes and methods provided by NPOI to work with Excel files in your C# code. For example, you can use the WorkbookFactory class to create a new workbook, the Sheet class to create and manage sheets in the workbook, and the Row and Cell classes to create and manage rows and cells in a sheet.
Here is an example of how to use NPOI to create a new Excel workbook and write some data to it:
This code will create a new Excel workbook and write the string “Hello, World!” to the first cell of the first sheet in the workbook. The workbook will be saved to a file named “myworkbook.xlsx” in the current directory.