Microsoft Office Interop (Excel Automation) in C# and VB.NET

Better than Excel Automation

The following table lists the pros and cons of using the GemBox.Spreadsheet component over Microsoft Excel automation.

Outperforming competition

When comparing and evaluating different XLSX, XLS, XLSB, ODS, CSV reading products and HTML, PDF, and XPS reporting products, don't forget the following considerations:

Plain and fair licensing

We don't charge for additional server licenses. You can use our component for an unlimited number of projects (you don't need to purchase additional "OEM licenses"), and we don't force you to purchase subscription packages.

Our licensing is very simple: every developer working with our component must have a developer license. We don't care if it is a Windows or web application, how many servers you use, or if you have just one or millions of customers.

Performance

In the case of a desktop application, you don't want your users to wait +10 seconds for every single report. In the case of a web application, you want your server to simultaneously support as many users as possible.

For comparison, our test uses a real-world-like Excel file containing 25 worksheets filled with tabular data, each sheet includes a mix of string and numeric values, along with a variety of cell formatting. The test simulates a common scenario: opening the Excel file, reading all allocated cells, and saving it back to disk. These were the results on our test machine:

• Microsoft Excel automation (Interop) took 8.98 seconds to complete the operation.
• GemBox.Spreadsheet completed the same task in 0.034 seconds (~266 times faster).

The performance example is included here, so you are free to do the test yourself and see how our component performs with the data that you require.

Clean and easy to use API

GemBox.Spreadsheet is designed and developed to conform to Microsoft's standards for .NET libraries. Caching also enables you to access the worksheet more naturally. For example, changing cell text orientation would be one line in GemBox.Spreadsheet:

ws.Cells[6, 0].Style.Rotation = 30;

and three lines in one of the competing products:

  XLStyle someStyle = new XLStyle(book);
  someStyle.Rotation = 30;
  sheet[6, 0].Style = someStyle;

The latter is a hassle and forces you to think about Excel's unique cell style limit. In other words, you must pay attention to not create the same cell style again in a more complex worksheet.

Portability

GemBox.Spreadsheet works on Windows, Linux, macOS, Android, and iOS operating systems.

100% managed code

Some similar products (and Microsoft Excel object) are old COM components with .NET RCW (Runtime Callable Wrapper). This brings many performance and interoperability disadvantages, as every method call you make goes through the wrapper until it reaches C++ code. On the other hand, our GemBox.Spreadsheet component is 100% managed, written entirely in C#, and designed to support both Visual Basic .NET and C# equally.

Test reading files with GemBox.Spreadsheet online

You can test reading the content of your Excel files with the interactive example below. Just upload your file and click on Run Example. After clicking on Run example, the C#/VB.NET code will be compiled, and the content of your file will be read with only the .NET framework and the GemBox.Spreadsheet component.

The following example loads the Excel file, iterates through its cells, and appends the content of the cells to StringBuilder.

using System;
using System.Text;
using GemBox.Spreadsheet;

class Program
{
    static void Main()
    {
        // If you are using the Professional version, enter your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

        var workbook = ExcelFile.Load("%InputFileName%");

        var sb = new StringBuilder();

        // Iterate through all worksheets in an Excel workbook.
        foreach (var worksheet in workbook.Worksheets)
        {
            sb.AppendLine();
            sb.AppendFormat("{0} {1} {0}", new string('-', 25), worksheet.Name);

            // Iterate through all rows in an Excel worksheet.
            foreach (var row in worksheet.Rows)
            {
                sb.AppendLine();

                // Iterate through all allocated cells in an Excel row.
                foreach (var cell in row.AllocatedCells)
                    if (cell.ValueType != CellValueType.Null)
                        sb.Append(string.Format("{0} [{1}]", cell.Value, cell.ValueType).PadRight(25));
                    else
                        sb.Append(new string(' ', 25));
            }
        }

        Console.WriteLine(sb.ToString());
    }
}

Imports System
Imports System.Text
Imports GemBox.Spreadsheet

Module Program

    Sub Main()

        ' If you are using the Professional version, enter your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

        Dim workbook = ExcelFile.Load("%InputFileName%")

        Dim sb = New StringBuilder()

        ' Iterate through all worksheets in an Excel workbook.
        For Each worksheet In workbook.Worksheets

            sb.AppendLine()
            sb.AppendFormat("{0} {1} {0}", New String("-"c, 25), worksheet.Name)

            ' Iterate through all rows in an Excel worksheet.
            For Each row In worksheet.Rows

                sb.AppendLine()

                ' Iterate through all allocated cells in an Excel row.
                For Each cell In row.AllocatedCells
                    If cell.ValueType <> CellValueType.Null Then
                        sb.Append(String.Format("{0} [{1}]", cell.Value, cell.ValueType).PadRight(25))
                    Else
                        sb.Append(New String(" "c, 25))
                    End If
                Next
            Next
        Next

        Console.WriteLine(sb.ToString())
    End Sub
End Module