Tutorials
Spire.XLS
Program Guide
Formula

Add Excel Formulas in C#, VB.NET

In an Excel Worksheet, we may import a great deal of data. Sometimes, we need to calculate the data to get other numbers we need. It is a time consuming job when we deal with large spreadsheets and more complex data. Formula is the main tool to calculate data. There are various formulas included in Excel. Below I will show you how to add formula in C#, VB.NET by Spire.XLS.

Spire.XLS .NET is a Professional and stable .NET Excel component which enables developers/programmers to operate Excel files with their ASP.NET web sites and Windows Forms applications. It supports calculate complex Excel Formulas. Spire.XLS presents you an easiest way to add formula for Excel.

Please check the effective screenshot first.

Add Excel Formulas

Now we will give you a demo with many kinds of formulas written in the worksheet. The formula can be string, bool value, calculation, sheet area reference, time and so on. Here, we first reference a variable "currentRow" to control rows of all kinds of formulas. Second, reference "currentFormula". Assign value for Worksheet.Range [cellRange]. Text to write a formula, and then via currentFormula to assign value for Worksheet.Range [cellRange]. Formula to get the formula results.

[C#]
using Spire.Xls;

namespace Formula
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a new workbook
            Workbook workbook = new Workbook();

            //Initialize worksheet
            Worksheet sheet = workbook.Worksheets[0];

            //initialize currentRow
            int currentRow = 3;
            string currentFormula = string.Empty;
            
            //test data
            sheet.Range[currentRow, 2].NumberValue = 7.3;
            sheet.Range[currentRow, 3].NumberValue = 5; ;
            sheet.Range[currentRow, 4].NumberValue = 8.2;
            sheet.Range[currentRow, 5].NumberValue = 4;
            sheet.Range[currentRow, 6].NumberValue = 3;
            sheet.Range[currentRow, 7].NumberValue = 11.3;
            
            //string.
            currentFormula = "=\"hello\"";
            sheet.Range[++currentRow, 1].Text = "=\"hello\"";
            sheet.Range[currentRow, 2].Formula = currentFormula;

            //bool.
            currentFormula = "=false";
            sheet.Range[++currentRow, 1].Text = currentFormula;
            sheet.Range[currentRow, 2].Formula = currentFormula;

            //calculation
            currentFormula = "=33*3/4-2+10";
            sheet.Range[++currentRow, 1].Text = currentFormula;
            sheet.Range[currentRow, 2].Formula = currentFormula;

            //sheet area reference
            currentFormula = "=AVERAGE(Sheet1!$D$3:G$3)";
            sheet.Range[++currentRow, 1].Text = currentFormula;
            sheet.Range[currentRow, 2].Formula = currentFormula;

            //time
            currentFormula = "=NOW()";
            sheet.Range[++currentRow, 1].Text = currentFormula;
            sheet.Range[currentRow, 2].Formula = currentFormula;
            sheet.Range[currentRow, 2].Style.NumberFormat = "yyyy-MM-DD";

            //Save the file
            workbook.SaveToFile("Sample.xls",ExcelVersion.Version97to2003);

            //Launch the file
            System.Diagnostics.Process.Start("Sample.xls");
        }
    }
}
[VB.NET]
Imports Spire.Xls

Module Module1

    Sub Main()
        'Create a new workbook
        Dim workbook As New Workbook()

        'Initialize worksheet
        Dim sheet As Worksheet = workbook.Worksheets(0)

        'initialize currentRow
        Dim currentRow As Integer = 3
        Dim currentFormula As String = String.Empty

        'test data
        sheet.Range(currentRow, 2).NumberValue = 7.3
        sheet.Range(currentRow, 3).NumberValue = 5


        sheet.Range(currentRow, 4).NumberValue = 8.2
        sheet.Range(currentRow, 5).NumberValue = 4
        sheet.Range(currentRow, 6).NumberValue = 3
        sheet.Range(currentRow, 7).NumberValue = 11.3

        'string.
        currentFormula = "=""hello"""
        sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = "=""hello"""
        sheet.Range(currentRow, 2).Formula = currentFormula

        'bool.
        currentFormula = "=false"
        sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
        sheet.Range(currentRow, 2).Formula = currentFormula

        'calculation
        currentFormula = "=33*3/4-2+10"
        sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
        sheet.Range(currentRow, 2).Formula = currentFormula

        'sheet area reference
        currentFormula = "=AVERAGE(Sheet1!$D$3:G$3)"
        sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
        sheet.Range(currentRow, 2).Formula = currentFormula

        'time
        currentFormula = "=NOW()"
        sheet.Range(System.Threading.Interlocked.Increment(currentRow), 1).Text = currentFormula
        sheet.Range(currentRow, 2).Formula = currentFormula
        sheet.Range(currentRow, 2).Style.NumberFormat = "yyyy-MM-DD"


        'Save doc file.
        workbook.SaveToFile("Sample.xls",ExcelVersion.Version97to2003)

        'Launching the MS Word file.
        System.Diagnostics.Process.Start("Sample.xls")

    End Sub
End Module

Spire.XLS supports many methods to add a formula for Excel including different parts. As a professional .NET Excel component, it owns the ability of inserting content into Excel document, formatting cells and converting Excel documents to popular office file formats. Spire.XLS for WPF supports Excel 97-2003, Excel 2007 and Excel 2010.

See Also