USING IRONXL

Generate Excel Files in C#

The applications we develop are constantly communicating with Excel spreadsheets to obtain data for evaluation and results. It's really helpful to be able to generate Excel files in C# programmatically, saving us time and effort with our development. In this tutorial, we'll learn about generating Excel files in different formats, setting cell styles, and inserting data using efficient function C# programming.


Step 1

1. Generate Excel Files with IronXL

Generate Excel Files using the IronXL Excel for C# Library, providing a range of functions for generating and manipulating data in your project. The library is free for development, with licenses available when you're ready to push live. To follow this tutorial, you can download IronXL for generating or access it through Visual Studio and NuGet gallery.


dotnet add package IronXL.Excel

How to Tutorial

2. C# Excel File Generator Overview

In business application development, we often need to generate different types of Excel files programmatically. For this purpose, we need the easiest and quickest way to generate different types of files and save them in the required location automatically.

After installing IronXL, we can use the functions to generate different Excel file types:

  • Excel file with .xlsx extension.
  • Excel file with .xls extension.
  • Comma Separated Value (.csv) files.
  • Tab Separated Value (.tsv) files.
  • JavaScript Object Notation (.json) files.
  • Extensible Markup Language (.xml) files.

To generate any type of file, firstly we need to create an Excel WorkBook.

// Generate a new WorkBook
WorkBook wb = WorkBook.Create();
// Generate a new WorkBook
WorkBook wb = WorkBook.Create();
' Generate a new WorkBook
Dim wb As WorkBook = WorkBook.Create()
$vbLabelText   $csharpLabel

The above line of code will create a new WorkBook named wb. Now we will create a WorkSheet object.

// Generate a new WorkSheet
WorkSheet ws = wb.CreateWorkSheet("SheetName");
// Generate a new WorkSheet
WorkSheet ws = wb.CreateWorkSheet("SheetName");
' Generate a new WorkSheet
Dim ws As WorkSheet = wb.CreateWorkSheet("SheetName")
$vbLabelText   $csharpLabel

This will create a WorkSheet named ws that we can use to insert data in Excel files.


3. Generate XLSX File C#

First, we follow the steps above to generate the WorkBook and WorkSheet.

Then, we insert data into it to create our .xlsx extension file. For this purpose, IronXL provides a Cell Addressing System that allows us to insert data into a specific cell address programmatically.

// Insert data by cell addressing
ws["CellAddress"].Value = "MyValue";
// Insert data by cell addressing
ws["CellAddress"].Value = "MyValue";
' Insert data by cell addressing
ws("CellAddress").Value = "MyValue"
$vbLabelText   $csharpLabel

It will insert a new value "MyValue" in a specific cell address. In the same way, we can insert data into as many cells as we require. After this, we will save the Excel file in the specified path as follows:

// Specify file path and name
wb.SaveAs("Path + FileName.xlsx");
// Specify file path and name
wb.SaveAs("Path + FileName.xlsx");
' Specify file path and name
wb.SaveAs("Path + FileName.xlsx")
$vbLabelText   $csharpLabel

This will create a new Excel file with the extension .xlsx in the specified path. Don't forget to write the extension .xlsx with the file name while saving.

To take a step further into how to create an Excel WorkBook in a C# project, check out the code examples here.

/**
 * Generate XLSX File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook of .xlsx Extension
        WorkBook wb = WorkBook.Create(ExcelFileFormat.XLSX);

        // Create workSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";
        ws["C4"].Value = "IronXL";

        // Save the file as .xlsx
        wb.SaveAs("sample.xlsx");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
/**
 * Generate XLSX File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook of .xlsx Extension
        WorkBook wb = WorkBook.Create(ExcelFileFormat.XLSX);

        // Create workSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";
        ws["C4"].Value = "IronXL";

        // Save the file as .xlsx
        wb.SaveAs("sample.xlsx");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
'''
''' * Generate XLSX File
''' 
Imports System
Imports IronXL

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create new WorkBook of .xlsx Extension
		Dim wb As WorkBook = WorkBook.Create(ExcelFileFormat.XLSX)

		' Create workSheet
		Dim ws As WorkSheet = wb.CreateWorkSheet("Sheet1")

		' Insert data in the cells of WorkSheet
		ws("A1").Value = "Hello"
		ws("A2").Value = "World"
		ws("C4").Value = "IronXL"

		' Save the file as .xlsx
		wb.SaveAs("sample.xlsx")

		Console.WriteLine("Successfully created.")
		Console.ReadKey()
	End Sub
End Class
$vbLabelText   $csharpLabel

You can see a screenshot of the newly created Excel file sample.xlsx here:

Generate Excel Files in C#, Figure 1: The result of the modified value in cell C4 The result of the modified value in cell C4


4. Generate XLS File C#

It is also possible to generate .xls files using IronXL. For this purpose, we will use the WorkBook.Create() function as follows:

// Create a workbook with XLS format
WorkBook wb = WorkBook.Create(ExcelFileFormat.XLS);
// Create a workbook with XLS format
WorkBook wb = WorkBook.Create(ExcelFileFormat.XLS);
' Create a workbook with XLS format
Dim wb As WorkBook = WorkBook.Create(ExcelFileFormat.XLS)
$vbLabelText   $csharpLabel

This will create a new Excel file with a .xls extension. Keep in mind that while assigning a name to an Excel file, you must write the extension .xls with the file name, like this:

// Save the file as .xls
wb.SaveAs("Path + FileName.xls");
// Save the file as .xls
wb.SaveAs("Path + FileName.xls");
' Save the file as .xls
wb.SaveAs("Path + FileName.xls")
$vbLabelText   $csharpLabel

Now, let's see the example of how to generate an Excel file with a .xls extension:

/**
 * Generate XLS File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook of .xls Extension
        WorkBook wb = WorkBook.Create(ExcelFileFormat.XLS);

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .xls
        wb.SaveAs("sample.xls");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
/**
 * Generate XLS File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook of .xls Extension
        WorkBook wb = WorkBook.Create(ExcelFileFormat.XLS);

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .xls
        wb.SaveAs("sample.xls");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
'''
''' * Generate XLS File
''' 
Imports System
Imports IronXL

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create new WorkBook of .xls Extension
		Dim wb As WorkBook = WorkBook.Create(ExcelFileFormat.XLS)

		' Create WorkSheet
		Dim ws As WorkSheet = wb.CreateWorkSheet("Sheet1")

		' Insert data in the cells of WorkSheet
		ws("A1").Value = "Hello"
		ws("A2").Value = "World"

		' Save the file as .xls
		wb.SaveAs("sample.xls")

		Console.WriteLine("Successfully created.")
		Console.ReadKey()
	End Sub
End Class
$vbLabelText   $csharpLabel

5. Generate CSV File C#

Comma Separated Value (.csv) files also play a very important role in keeping data in different types of organizations. So, we also need to learn how to generate .csv files and insert data into them programmatically.

We can use the same process as above, but we need to specify the .csv extension with the file name while saving. Let's see an example of how to create .csv files in our C# project:

/**
 * Generate CSV File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .csv
        wb.SaveAsCsv("sample.csv");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
/**
 * Generate CSV File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .csv
        wb.SaveAsCsv("sample.csv");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
'''
''' * Generate CSV File
''' 
Imports System
Imports IronXL

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create new WorkBook
		Dim wb As WorkBook = WorkBook.Create()

		' Create WorkSheet
		Dim ws As WorkSheet = wb.CreateWorkSheet("Sheet1")

		' Insert data in the cells of WorkSheet
		ws("A1").Value = "Hello"
		ws("A2").Value = "World"

		' Save the file as .csv
		wb.SaveAsCsv("sample.csv")

		Console.WriteLine("Successfully created.")
		Console.ReadKey()
	End Sub
End Class
$vbLabelText   $csharpLabel

To be able to interact more with CSV files, you can follow this tutorial to read .csv file.


6. Generate TSV File C#

Sometimes we need to generate Tab Separated Value (.tsv) files and insert data programmatically.

Using IronXL we can also generate .tsv extension files, insert data into them, and then save it to the required location.

Let's see the example of how to generate .tsv extension files:

/**
 * Generate TSV File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .tsv
        wb.SaveAsTsv("sample.tsv");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
/**
 * Generate TSV File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .tsv
        wb.SaveAsTsv("sample.tsv");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
'''
''' * Generate TSV File
''' 
Imports System
Imports IronXL

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create new WorkBook
		Dim wb As WorkBook = WorkBook.Create()

		' Create WorkSheet
		Dim ws As WorkSheet = wb.CreateWorkSheet("Sheet1")

		' Insert data in the cells of WorkSheet
		ws("A1").Value = "Hello"
		ws("A2").Value = "World"

		' Save the file as .tsv
		wb.SaveAsTsv("sample.tsv")

		Console.WriteLine("Successfully created.")
		Console.ReadKey()
	End Sub
End Class
$vbLabelText   $csharpLabel

7. Generate JSON File C#

We can comfortably say that JavaScript Object Notation (.json) files are the most common data files and are used in almost all software development companies. Therefore, we often need to save the data in JSON format. For this, we need the simplest method to generate JSON format files and insert the data into them.

In such conditions, IronXL is the best option by which we can easily generate these files for C#. Let's see the example.

/**
 * Generate JSON File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "1";
        ws["A2"].Value = "john";
        ws["B1"].Value = "2";
        ws["B2"].Value = "alex";
        ws["C1"].Value = "3";
        ws["C2"].Value = "stokes";

        // Save the file as .json
        wb.SaveAsJson("sample.json");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
/**
 * Generate JSON File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "1";
        ws["A2"].Value = "john";
        ws["B1"].Value = "2";
        ws["B2"].Value = "alex";
        ws["C1"].Value = "3";
        ws["C2"].Value = "stokes";

        // Save the file as .json
        wb.SaveAsJson("sample.json");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
'''
''' * Generate JSON File
''' 
Imports System
Imports IronXL

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create new WorkBook
		Dim wb As WorkBook = WorkBook.Create()

		' Create WorkSheet
		Dim ws As WorkSheet = wb.CreateWorkSheet("Sheet1")

		' Insert data in the cells of WorkSheet
		ws("A1").Value = "1"
		ws("A2").Value = "john"
		ws("B1").Value = "2"
		ws("B2").Value = "alex"
		ws("C1").Value = "3"
		ws("C2").Value = "stokes"

		' Save the file as .json
		wb.SaveAsJson("sample.json")

		Console.WriteLine("Successfully created.")
		Console.ReadKey()
	End Sub
End Class
$vbLabelText   $csharpLabel

And review the screenshot of the newly created JSON file sample.json :

Generate Excel Files in C#, Figure 2: Navigating to NuGet Package Manager in Visual Studio Navigating to NuGet Package Manager in Visual Studio


8. Generate XML File C#

In business application development, we often need to save the data in the Extensible Markup Language (.xml) file format. This is important because .xml file data is readable by both humans and machines.

Through the following examples, we will learn how to generate .xml files for C# and insert data programmatically.

/**
 * Generate XML File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .xml
        wb.SaveAsXml("sample.xml");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
/**
 * Generate XML File
 */
using System;
using IronXL;

class Program
{
    static void Main(string[] args)
    {
        // Create new WorkBook
        WorkBook wb = WorkBook.Create();

        // Create WorkSheet
        WorkSheet ws = wb.CreateWorkSheet("Sheet1");

        // Insert data in the cells of WorkSheet
        ws["A1"].Value = "Hello";
        ws["A2"].Value = "World";

        // Save the file as .xml
        wb.SaveAsXml("sample.xml");

        Console.WriteLine("Successfully created.");
        Console.ReadKey();
    }
}
'''
''' * Generate XML File
''' 
Imports System
Imports IronXL

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Create new WorkBook
		Dim wb As WorkBook = WorkBook.Create()

		' Create WorkSheet
		Dim ws As WorkSheet = wb.CreateWorkSheet("Sheet1")

		' Insert data in the cells of WorkSheet
		ws("A1").Value = "Hello"
		ws("A2").Value = "World"

		' Save the file as .xml
		wb.SaveAsXml("sample.xml")

		Console.WriteLine("Successfully created.")
		Console.ReadKey()
	End Sub
End Class
$vbLabelText   $csharpLabel

You can read more about converting Excel spreadsheets and files programmatically for use in C# projects.

IronXL library also offers a wide range of features to interact with Excel files such as cell data formatting, merging cells, inserting math functions, and even managing charts.


Tutorial Quick Access

IronXL Generator Documentation

Read the full documentation on how IronXL generates files in every Excel format necessary for your C# project.

IronXL Generator Documentation
Documentation related to Tutorial Quick Access

Frequently Asked Questions

What is used for generating Excel files in C# projects?

IronXL is a library used in C# projects to generate and manipulate Excel files, including various formats like XLSX, XLS, CSV, TSV, JSON, and XML.

How can I install the required library in my C# project for Excel operations?

You can install IronXL using the NuGet package manager in Visual Studio with the command `dotnet add package IronXL.Excel`.

What are the steps to generate an XLSX file in C#?

To generate an XLSX file, create a WorkBook and WorkSheet, insert data using the Cell Addressing System, and save the file with an '.xlsx' extension using IronXL.

Can I generate CSV files in C# projects?

Yes, you can generate CSV files using IronXL by creating a WorkBook and WorkSheet, inserting the necessary data, and using the SaveAsCsv method.

What is the purpose of using JSON files in C# projects?

JSON files are commonly used for data interchange between systems and applications due to their lightweight and human-readable format. They are widely used in software development for saving and exchanging data.

How can I generate a JSON file in C#?

To generate a JSON file using IronXL, create a WorkBook and WorkSheet, insert data, and use the SaveAsJson method to save the file in the desired location.

What formats can be exported in C# projects besides XLSX and XLS?

Besides XLSX and XLS, IronXL can export to CSV, TSV, JSON, and XML formats, allowing for versatile data handling in C# projects.

Is the library free to use for Excel file operations during development?

IronXL is free for development purposes. However, a license is required when you are ready to deploy or go live with your project.

What is the advantage of using a library for Excel operations in business applications?

IronXL simplifies the process of generating and manipulating Excel files programmatically, which is crucial in business applications for automating data processing tasks.

Can XML file generation be handled in C# projects?

Yes, IronXL can generate XML files by creating a WorkBook, inserting data, and using the SaveAsXml method to export the data in XML format.

Regan Pun
Software Engineer
Regan graduated from the University of Reading, with a BA in Electronic Engineering. Before joining Iron Software, his previous job roles had him laser-focused on single tasks; and what he most enjoys at Iron Software is the spectrum of work he gets to undertake, whether it’s adding value to sales, technical support, product development or marketing. He enjoys understanding the way developers are using the Iron Software library, and using that knowledge to continually improve documentation and develop the products.
< PREVIOUS
Create a CSV file using C#
NEXT >
Work with Excel in .NET Core