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.
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.
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:
.xlsx extension..xls extension..csv) files..tsv) files..json) files..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
Dim wb As WorkBook = WorkBook.Create()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
Dim ws As WorkSheet = wb.CreateWorkSheet("SheetName")This will create a WorkSheet named ws that we can use to insert data in Excel files.
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"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")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
Imports System
Imports IronXL
Module Program
Sub Main(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 ModuleYou can see a screenshot of the newly created Excel file sample.xlsx here:
The result of the modified value in cell C4
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
Dim wb As WorkBook = WorkBook.Create(ExcelFileFormat.XLS)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")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
Imports System
Imports IronXL
Module Program
Sub Main(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 ModuleComma 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
Imports System
Imports IronXL
Module Program
Sub Main(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 ModuleTo be able to interact more with CSV files, you can follow this tutorial to read .csv file.
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
Imports System
Imports IronXL
Module Program
Sub Main(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 ModuleWe 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
Imports System
Imports IronXL
Module Program
Sub Main(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 ModuleAnd review the screenshot of the newly created JSON file sample.json :
Navigating to NuGet Package Manager in Visual Studio
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
Imports System
Imports IronXL
Module Program
Sub Main(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 ModuleYou 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.
Read the full documentation on how IronXL generates files in every Excel format necessary for your C# project.
IronXL Generator Documentation
Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.
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