How to Import Excel Data in C# Using IronXL

How Do You Install IronXL and Get Started with Excel Import?

Getting started with Excel import in C# takes just minutes with IronXL. The Excel library handles both legacy XLS and modern XLSX formats, along with CSV, TSV, and other spreadsheet formats. Unlike solutions that rely on Microsoft.Office.Interop.Excel, IronXL runs independently on any .NET or .NET Core platform.

Install IronXL via the NuGet Package Manager or the .NET CLI. You can also use the Manage NuGet Packages dialog in Visual Studio and search for "IronXL":

Install-Package IronXL
dotnet add package IronXL

Install-Package IronXL
dotnet add package IronXL

For full installation details, including version compatibility and dependency notes, refer to the IronXL NuGet installation guide. No additional runtime dependencies or Office components are required -- the package is self-contained. Once the package is installed, importing Excel data is straightforward:

using IronXL;

// Load any Excel file
WorkBook workBook = WorkBook.Load("ProductData.xlsx");
// Access the first worksheet
WorkSheet sheet = workBook.WorkSheets[0];
// Read a cell value
string value = sheet["B1"].StringValue;
Console.WriteLine(value);

using IronXL;

// Load any Excel file
WorkBook workBook = WorkBook.Load("ProductData.xlsx");
// Access the first worksheet
WorkSheet sheet = workBook.WorkSheets[0];
// Read a cell value
string value = sheet["B1"].StringValue;
Console.WriteLine(value);

This code demonstrates the core workflow: loading a workbook, accessing a worksheet, and reading cell values. The WorkBook.Load() method automatically detects the file format -- whether it's XLS, XLSX, or CSV. The intuitive indexer syntax sheet["B1"] makes accessing cells as natural as working with arrays. For a full reference of available members and overloads, see the IronXL API documentation.

How Do You Read Excel Data into C# Objects?

Real applications need more than single-cell values. IronXL excels at importing entire datasets and converting them into usable C# objects. When you need to import structured Excel data, the library provides multiple approaches that map directly to your domain models.

The example below reads rows from a worksheet and maps each row to a typed Product object:

using IronXL;

// Load the Excel file
WorkBook workBook = WorkBook.Load("ProductData.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// Map rows to typed objects
var products = new List<Product>();
foreach (var row in sheet.Rows)
{
    var product = new Product
    {
        Id = row.Columns[0].IntValue,
        Name = row.Columns[1].StringValue,
        Price = row.Columns[2].DecimalValue,
        IsAvailable = row.Columns[3].BoolValue
    };
    products.Add(product);
}

foreach (var product in products)
{
    Console.WriteLine(
        $"Id: {product.Id}, Name: {product.Name}, " +
        $"Price: {product.Price}, Available: {product.IsAvailable}"
    );
}

using IronXL;

// Load the Excel file
WorkBook workBook = WorkBook.Load("ProductData.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// Map rows to typed objects
var products = new List<Product>();
foreach (var row in sheet.Rows)
{
    var product = new Product
    {
        Id = row.Columns[0].IntValue,
        Name = row.Columns[1].StringValue,
        Price = row.Columns[2].DecimalValue,
        IsAvailable = row.Columns[3].BoolValue
    };
    products.Add(product);
}

foreach (var product in products)
{
    Console.WriteLine(
        $"Id: {product.Id}, Name: {product.Name}, " +
        $"Price: {product.Price}, Available: {product.IsAvailable}"
    );
}

The typed properties -- IntValue, StringValue, DecimalValue, and BoolValue -- handle type conversion automatically. This approach eliminates manual parsing and reduces errors when working with columns of mixed data types. Many developers on Stack Overflow appreciate this type-safe approach to Excel data import.

using IronXL;

WorkBook workBook = WorkBook.Load("ProductData.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// Read a named cell range
Range dataRange = sheet["A1:D5"];

// Calculate aggregates directly on a range
decimal sum = sheet["C1:C5"].Sum();
Console.WriteLine($"Sum of C1:C5: {sum}");

decimal max = sheet["C1:C5"].Max(c => c.DecimalValue);
Console.WriteLine($"Max of C1:C5: {max}");

// Filter using LINQ
var highValueOrders = dataRange
    .Where(cell => cell.DecimalValue > 100)
    .Select(cell => cell.Value)
    .ToList();

Console.WriteLine("Orders above 100:");
foreach (var order in highValueOrders)
{
    Console.WriteLine(order);
}

using IronXL;

WorkBook workBook = WorkBook.Load("ProductData.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// Read a named cell range
Range dataRange = sheet["A1:D5"];

// Calculate aggregates directly on a range
decimal sum = sheet["C1:C5"].Sum();
Console.WriteLine($"Sum of C1:C5: {sum}");

decimal max = sheet["C1:C5"].Max(c => c.DecimalValue);
Console.WriteLine($"Max of C1:C5: {max}");

// Filter using LINQ
var highValueOrders = dataRange
    .Where(cell => cell.DecimalValue > 100)
    .Select(cell => cell.Value)
    .ToList();

Console.WriteLine("Orders above 100:");
foreach (var order in highValueOrders)
{
    Console.WriteLine(order);
}

How Do You Convert Excel to DataTable in C#?

DataTable conversion is essential for database operations and data binding scenarios. IronXL provides built-in methods that handle the conversion from Excel to DataSet or DataTable. This feature is particularly useful when you need to import Excel spreadsheets into SQL Server or other relational databases. Because the resulting object is a standard System.Data.DataTable, it works with any ADO.NET-compatible code path without requiring changes to your data access layer.

using IronXL;
using System.Data;
using System.Data.SqlClient;

// Load Excel file
WorkBook workBook = WorkBook.Load("inventory.xlsx");
// Select the first worksheet
WorkSheet sheet = workBook.WorkSheets.First();

// Convert to DataTable -- first row becomes column headers
DataTable dataTable = sheet.ToDataTable(true);

// Use SqlBulkCopy to insert directly into SQL Server
string connectionString = "Data Source=.;Initial Catalog=InventoryDB;Integrated Security=True;";
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connectionString))
{
    bulkCopy.DestinationTableName = "Inventory";
    bulkCopy.WriteToServer(dataTable);
}

using IronXL;
using System.Data;
using System.Data.SqlClient;

// Load Excel file
WorkBook workBook = WorkBook.Load("inventory.xlsx");
// Select the first worksheet
WorkSheet sheet = workBook.WorkSheets.First();

// Convert to DataTable -- first row becomes column headers
DataTable dataTable = sheet.ToDataTable(true);

// Use SqlBulkCopy to insert directly into SQL Server
string connectionString = "Data Source=.;Initial Catalog=InventoryDB;Integrated Security=True;";
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connectionString))
{
    bulkCopy.DestinationTableName = "Inventory";
    bulkCopy.WriteToServer(dataTable);
}

The ToDataTable() method accepts a boolean parameter indicating whether the first row contains headers. When set to true, IronXL automatically uses the first-row values as column names. The resulting DataTable integrates with ADO.NET, Entity Framework, and data binding controls without any additional configuration.

For more control over the conversion process, you can build the DataTable manually:

using IronXL;
using System.Data;

WorkBook workBook = WorkBook.Load("inventory.xlsx");
WorkSheet sheet = workBook.WorkSheets.First();

// Build DataTable manually for custom column types or validation
DataTable customTable = new DataTable();

for (int col = 0; col < sheet.ColumnCount; col++)
{
    customTable.Columns.Add($"Column{col + 1}", typeof(string));
}

foreach (var row in sheet.Rows)
{
    var dataRow = customTable.NewRow();
    for (int col = 0; col < sheet.ColumnCount; col++)
    {
        dataRow[col] = row.Columns[col].Value ?? DBNull.Value;
    }
    customTable.Rows.Add(dataRow);
}

// Print headers
foreach (DataColumn column in customTable.Columns)
{
    Console.Write($"{column.ColumnName}\t");
}
Console.WriteLine();

// Print data rows
foreach (DataRow row in customTable.Rows)
{
    foreach (var item in row.ItemArray)
    {
        Console.Write($"{item}\t");
    }
    Console.WriteLine();
}

using IronXL;
using System.Data;

WorkBook workBook = WorkBook.Load("inventory.xlsx");
WorkSheet sheet = workBook.WorkSheets.First();

// Build DataTable manually for custom column types or validation
DataTable customTable = new DataTable();

for (int col = 0; col < sheet.ColumnCount; col++)
{
    customTable.Columns.Add($"Column{col + 1}", typeof(string));
}

foreach (var row in sheet.Rows)
{
    var dataRow = customTable.NewRow();
    for (int col = 0; col < sheet.ColumnCount; col++)
    {
        dataRow[col] = row.Columns[col].Value ?? DBNull.Value;
    }
    customTable.Rows.Add(dataRow);
}

// Print headers
foreach (DataColumn column in customTable.Columns)
{
    Console.Write($"{column.ColumnName}\t");
}
Console.WriteLine();

// Print data rows
foreach (DataRow row in customTable.Rows)
{
    foreach (var item in row.ItemArray)
    {
        Console.Write($"{item}\t");
    }
    Console.WriteLine();
}

This approach gives you full flexibility during import. Null values are handled gracefully by converting them to DBNull.Value, ensuring compatibility with database column constraints. For further guidance on writing data back to files, see the IronXL write Excel file guide.

How Do You Work with Formulas, Multi-Sheet Workbooks, and Entity Framework?

IronXL goes beyond basic reading with features for complex real-world scenarios. The library preserves Excel formulas, allowing calculations to be evaluated dynamically. For developers working with complex Excel workbooks, this maintains data integrity throughout the import process.

using IronXL;

WorkBook workBook = WorkBook.Load("FinancialReport.xlsx");
WorkSheet sheet = workBook.GetWorkSheet("Reports");

// Read the evaluated result of a formula cell
decimal calculatedTotal = sheet["E10"].DecimalValue;
Console.WriteLine($"Total: {calculatedTotal}");

// Read the formula string itself
string formula = sheet["E10"].Formula;
Console.WriteLine($"Formula: {formula}"); // e.g. "=SUM(E2:E9)"

using IronXL;

WorkBook workBook = WorkBook.Load("FinancialReport.xlsx");
WorkSheet sheet = workBook.GetWorkSheet("Reports");

// Read the evaluated result of a formula cell
decimal calculatedTotal = sheet["E10"].DecimalValue;
Console.WriteLine($"Total: {calculatedTotal}");

// Read the formula string itself
string formula = sheet["E10"].Formula;
Console.WriteLine($"Formula: {formula}"); // e.g. "=SUM(E2:E9)"

using IronXL;

WorkBook workBook = WorkBook.Load("ProductData.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// Skip the header row, map remaining rows to entity objects
var products = sheet.Rows
    .Skip(1)
    .Select(row => new Product
    {
        Name = row.Columns[0].StringValue,
        Price = row.Columns[1].DecimalValue
    })
    .ToList();

using var context = new AppDbContext();
await context.Products.AddRangeAsync(products);
await context.SaveChangesAsync();

Console.WriteLine($"Imported {products.Count} products.");

using IronXL;

WorkBook workBook = WorkBook.Load("ProductData.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// Skip the header row, map remaining rows to entity objects
var products = sheet.Rows
    .Skip(1)
    .Select(row => new Product
    {
        Name = row.Columns[0].StringValue,
        Price = row.Columns[1].DecimalValue
    })
    .ToList();

using var context = new AppDbContext();
await context.Products.AddRangeAsync(products);
await context.SaveChangesAsync();

Console.WriteLine($"Imported {products.Count} products.");

How Do You Handle Cell Formatting During Import?

When you import Excel files, preserving or inspecting cell formatting is often as important as reading the raw values. IronXL exposes font, color, alignment, and border properties for every cell, so you can apply validation rules or reproduce styles programmatically. This is particularly useful for reports where visual formatting carries semantic meaning -- for example, colored cells indicating risk levels, or bold rows marking totals.

For example, you might want to check whether cells contain bold text -- a common signal that a row is a summary or total row -- before deciding whether to include it in your imported dataset:

using IronXL;

WorkBook workBook = WorkBook.Load("StyledReport.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

foreach (var row in sheet.Rows)
{
    var firstCell = row.Columns[0];

    // Skip rows where the first cell is bold (typically header or total rows)
    if (firstCell.Style.Font.Bold)
    {
        continue;
    }

    Console.WriteLine($"Data row: {firstCell.StringValue}");
}

using IronXL;

WorkBook workBook = WorkBook.Load("StyledReport.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

foreach (var row in sheet.Rows)
{
    var firstCell = row.Columns[0];

    // Skip rows where the first cell is bold (typically header or total rows)
    if (firstCell.Style.Font.Bold)
    {
        continue;
    }

    Console.WriteLine($"Data row: {firstCell.StringValue}");
}

For a full reference on cell and range formatting, including number format strings and background color access, see the IronXL cell formatting guide. You can also apply merge operations to output files after processing -- see the IronXL merge cells guide.

How Do You Choose the Right IronXL License for Your Project?

IronXL offers flexible licensing options to match the scale of your project. A free trial license is available for evaluation, which gives you access to all features without time restrictions during development. The trial adds a watermark to output files, which is removed with a valid production license.

For teams building production applications, IronXL licensing includes options for individual developers, teams, and organization-wide deployments. All production licenses include:

• Royalty-free redistribution rights
• Priority support from the IronXL development team
• Access to all current and minor-version updates during the license period

If you are evaluating IronXL alongside other Excel libraries, the IronXL features overview provides a detailed breakdown of what is included at each tier.

To begin using IronXL in your project today, visit the IronXL product page or start directly with the IronXL documentation for setup guides, how-to articles, and API references covering every feature in the library.