The C# XLSX Library

using IronXL;

//Import any XLSX,XLS, CSV or TSV Spreadsheet.
WorkBook workbook = WorkBook.Load("test.xls");

//Optionally Edit the Spreadsheet
workbook.Metadata.Title = "Import & Export Example";

//Export to many formats with fluent saving
workbook.SaveAs("test.xls");
workbook.SaveAs("export.xlsx");
workbook.SaveAsCsv("export.csv");
workbook.SaveAsJson("export.json");
workbook.SaveAsXml("export.xml");

//Also Export to a DataSet to allow easy integration with DataGrids, SQL and EF
System.Data.DataSet dataSet = workbook.ToDataSet();

Imports IronXL

'Import any XLSX,XLS, CSV or TSV Spreadsheet.
Private workbook As WorkBook = WorkBook.Load("test.xls")

'Optionally Edit the Spreadsheet
workbook.Metadata.Title = "Import & Export Example"

'Export to many formats with fluent saving
workbook.SaveAs("test.xls")
workbook.SaveAs("export.xlsx")
workbook.SaveAsCsv("export.csv")
workbook.SaveAsJson("export.json")
workbook.SaveAsXml("export.xml")

'Also Export to a DataSet to allow easy integration with DataGrids, SQL and EF
Dim dataSet As System.Data.DataSet = workbook.ToDataSet()

using IronXL;
using System.Linq;
    
//Supported spreadsheet formats for reading include: XLSX, XLS, CSV and TSV
WorkBook workbook = WorkBook.Load("test.xlsx");
WorkSheet sheet = workbook.WorkSheets.First();

//Select cells easily in Excel notation and return the calculated value
int cellValue = sheet["A2"].IntValue;


// Read from Ranges of cells elegantly.
foreach (var cell in sheet["A2:A10"])
{
    Console.WriteLine("Cell {0} has value '{1}'", cell.AddressString, cell.Text);
}

//Calculate aggregate values such as Min, Max and Sum
decimal sum = sheet["A2:A10"].Sum();


//Linq compatible
decimal max = sheet["A2:A10"].Max(c => c.DecimalValue);

Imports IronXL
Imports System.Linq

'Supported spreadsheet formats for reading include: XLSX, XLS, CSV and TSV
Private workbook As WorkBook = WorkBook.Load("test.xlsx")
Private sheet As WorkSheet = workbook.WorkSheets.First()

'Select cells easily in Excel notation and return the calculated value
Private cellValue As Integer = sheet("A2").IntValue


' Read from Ranges of cells elegantly.
For Each cell In sheet("A2:A10")
	Console.WriteLine("Cell {0} has value '{1}'", cell.AddressString, cell.Text)
Next cell

'Calculate aggregate values such as Min, Max and Sum
Dim sum As Decimal = sheet("A2:A10").Sum()


'Linq compatible
Dim max As Decimal = sheet("A2:A10").Max(Function(c) c.DecimalValue)

using IronXL;

//This is how we create new worksheet
WorkBook workBook = WorkBook.Load("test.xlsx");

//This is how we create new worksheet
var newSheet = workBook.CreateWorkSheet("new_sheet");
//You can perform any operations you want with the new sheet.
newSheet["B2"].Value = DateTime.Now;


// Work with an existing Worksheets 
WorkSheet oldSheet = workbook.GetWorkSheet("sheet1");
//...

// Work with the first Worksheet
WorkSheet firstSheet = workbook.DefaultWorkSheet;
//...


//Save in Excel format or export to many other file formats
workBook.SaveAs("test.xlsx");

Imports IronXL

'This is how we create new worksheet
Private workBook As WorkBook = WorkBook.Load("test.xlsx")

'This is how we create new worksheet
Private newSheet = workBook.CreateWorkSheet("new_sheet")
'You can perform any operations you want with the new sheet.
Private newSheet("B2").Value = Date.Now


' Work with an existing Worksheets 
Private oldSheet As WorkSheet = workbook.GetWorkSheet("sheet1")
'...

' Work with the first Worksheet
Private firstSheet As WorkSheet = workbook.DefaultWorkSheet
'...


'Save in Excel format or export to many other file formats
workBook.SaveAs("test.xlsx")

using IronXL;
using System.Linq;

WorkBook workbook = WorkBook.Load("test.xls");
WorkSheet sheet = workbook.WorkSheets.First();

//This is how we get range from Excel worksheet
var range = sheet["A2:A8"];
//This is how we can iterate over our range and read or edit any cell
foreach (var cell in range)
{
    Console.WriteLine(cell.Value);
}


// Another Example
var oneMoreRange = sheet["A9:A10"];

//This is how we can combine our ranges into a single selection
var resultRange = range + oneMoreRange;

//Iterate over new range - get or set any Cell
foreach (var cell in resultRange)
{
    Console.WriteLine(cell.Value);
}

Imports IronXL
Imports System.Linq

Private workbook As WorkBook = WorkBook.Load("test.xls")
Private sheet As WorkSheet = workbook.WorkSheets.First()

'This is how we get range from Excel worksheet
Private range = sheet("A2:A8")
'This is how we can iterate over our range and read or edit any cell
For Each cell In range
	Console.WriteLine(cell.Value)
Next cell


' Another Example
Dim oneMoreRange = sheet("A9:A10")

'This is how we can combine our ranges into a single selection
Dim resultRange = range + oneMoreRange

'Iterate over new range - get or set any Cell
For Each cell In resultRange
	Console.WriteLine(cell.Value)
Next cell

using IronXL;

//Create new Excel WorkBook document. 
//The default file format is XLSX, but we can override that for legacy support
WorkBook xlsWorkbook = WorkBook.Create(ExcelFileFormat.XLS);
xlsWorkbook.Metadata.Author = "IronXL";

//Add a blank WorkSheet
WorkSheet xlsSheet = xlsWorkbook.CreateWorkSheet("new_sheet");

//Add data and styles to the new worksheet
xlsSheet["A1"].Value = "Hello World";
xlsSheet["A2"].Style.BottomBorder.SetColor("#ff6600");
xlsSheet["A2"].Style.BottomBorder.Type = IronXL.Styles.BorderType.Double;

//Save the excel file
xlsWorkbook.SaveAs("NewExcelFile.xls");

Imports IronXL

'Create new Excel WorkBook document. 
'The default file format is XLSX, but we can override that for legacy support
Private xlsWorkbook As WorkBook = WorkBook.Create(ExcelFileFormat.XLS)
xlsWorkbook.Metadata.Author = "IronXL"

'Add a blank WorkSheet
Dim xlsSheet As WorkSheet = xlsWorkbook.CreateWorkSheet("new_sheet")

'Add data and styles to the new worksheet
xlsSheet("A1").Value = "Hello World"
xlsSheet("A2").Style.BottomBorder.SetColor("#ff6600")
xlsSheet("A2").Style.BottomBorder.Type = IronXL.Styles.BorderType.Double

'Save the excel file
xlsWorkbook.SaveAs("NewExcelFile.xls")

using IronXL;
using System.Data;

 //Open any Excel document.
WorkBook workbook = WorkBook.Load("test.xls");

// Convert the whole Excel WorkBook to a DataSet
// This allows us to work with DataGrids and System.Data.SQL nicely
var dataSet = workbook.ToDataSet();
foreach (DataTable table in dataSet.Tables)
{
    Console.WriteLine(table.TableName);

     //Enumerate by rows or columns first at your preference
	foreach (DataRow row in table.Rows)
	{
	    for (int i = 0; i < table.Columns.Count; i++)
	    {
	        Console.Write(row[i]);
	    }
	}
}

Imports IronXL
Imports System.Data

 'Open any Excel document.
Private workbook As WorkBook = WorkBook.Load("test.xls")

' Convert the whole Excel WorkBook to a DataSet
' This allows us to work with DataGrids and System.Data.SQL nicely
Private dataSet = workbook.ToDataSet()
For Each table As DataTable In dataSet.Tables
	Console.WriteLine(table.TableName)

	 'Enumerate by rows or columns first at your preference
	For Each row As DataRow In table.Rows
		For i As Integer = 0 To table.Columns.Count - 1
			Console.Write(row(i))
		Next i
	Next row
Next table

using IronXL;
using System.Data 

//Open any Excel document.
WorkBook workbook = WorkBook.Load("test.xls");


// Work with a single WorkSheet.  Can also use workbook.DefaultWorkSheet
WorkSheet sheet = workbook.GetWorkSheet("sheet1");

//Convert the worksheet to System.Data.DataTable
//Boolean parameter sets the first row as column names of your table.
System.Data.DataTable dataTable = sheet.ToDataTable(true);

//The DataTable can populate a DataGrid for example.

//Enumerate by rows or columns first at your preference
foreach (DataRow row in dataTable.Rows)
{
    for (int i = 0; i < dataTable.Columns.Count; i++)
    {
        Console.Write(row[i]);
    }
}

Imports IronXL
Imports System.Data WorkBook workbook = WorkBook.Load("test.xls")
'Open any Excel document.



' Work with a single WorkSheet.  Can also use workbook.DefaultWorkSheet
Private sheet As WorkSheet = workbook.GetWorkSheet("sheet1")

'Convert the worksheet to System.Data.DataTable
'Boolean parameter sets the first row as column names of your table.
Private dataTable As System.Data.DataTable = sheet.ToDataTable(True)

'The DataTable can populate a DataGrid for example.

'Enumerate by rows or columns first at your preference
For Each row As DataRow In dataTable.Rows
	For i As Integer = 0 To dataTable.Columns.Count - 1
		Console.Write(row(i))
	Next i
Next row