Excel cell formula

GemBox.Spreadsheet can read and write formulas, but the level of support depends on the Excel file format:

  • In XLS, all common and some advanced formulas are supported.
  • In XLSX, all formulas are supported. You only need to avoid array formulas in template files.
  • In ODS, all formulas are supported. However, OpenOffice formulas don't have the same syntax as Excel formulas.

Formulas can't be exported to CSV, HTML, PDF or XPS file formats.

Also note that formula values are automatically calculated when a file is opened in Excel.

Excel cell formulas set with GemBox.Spreadsheet
Screenshot of Excel cell formulas set with GemBox.Spreadsheet
using GemBox.Spreadsheet;

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

        var workbook = new ExcelFile();
        var worksheet = workbook.Worksheets.Add("Formula");

        int rowIndex = 0;

        worksheet.Columns[0].Width = 35 * 256;
        worksheet.Columns[1].Width = 15 * 256;
        worksheet.Columns[2].Width = 15 * 256;

        worksheet.Cells[rowIndex++, 0].Value = "Examples of typical formulas usage:";

        worksheet.Cells[++rowIndex, 0].Value = "Some data:";
        worksheet.Cells[rowIndex, 1].SetValue(3);
        worksheet.Cells[rowIndex, 2].SetValue(4.1);
        worksheet.Cells[++rowIndex, 1].SetValue(5.2);
        worksheet.Cells[rowIndex, 2].SetValue(6);
        worksheet.Cells[++rowIndex, 1].SetValue(7);
        worksheet.Cells[rowIndex++, 2].SetValue(8.3);

        // Named ranges.
        string namedRange = "Range1";
        worksheet.NamedRanges.Add(namedRange, worksheet.Cells.GetSubrange("B3", "C4"));

        // Floats without first digit.
        worksheet.Cells[++rowIndex, 0].Value = "Float number without first digit:";
        worksheet.Cells[rowIndex, 1].Formula = "=.5/23+.1-2";

        // Function using named range.
        worksheet.Cells[++rowIndex, 0].Value = "Named range:";
        worksheet.Cells[rowIndex, 1].Formula = "=SUM(" + namedRange + ")";

        // Function's miss argument.
        worksheet.Cells[++rowIndex, 0].Value = "Function's miss arguments:";
        worksheet.Cells[rowIndex, 1].Formula = "=Count(1,  ,  ,,,2, 23,,,,,, 34,,,54,,,,  ,)";

        // Functions are case-insensitive.
        worksheet.Cells[++rowIndex, 0].Value = "Functions are case-insensitive:";
        worksheet.Cells[rowIndex, 1].Formula = "=cOs( 1 )";

        // Functions.
        worksheet.Cells[++rowIndex, 0].Value = "Supported functions:";

        string nextFunction;
        worksheet.Cells[++rowIndex, 0].Value = "Results";
        worksheet.Cells[rowIndex++, 1].Value = "Formulas";

        nextFunction = "=NOW()+123";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=SECOND(12)/23";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=MINUTE(24)-1343/35";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=(HOUR(56)-23/35)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=WEEKDAY(5)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=YEAR(23)-WEEKDAY(5)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=MONTH(3)-2342/235345";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=((DAY(1)))";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=TIME(1,2,3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=DATE(1,2,3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=RAND()";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=TEXT(\"text\", \"$d\")";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=VAR(1,2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=MOD(1,2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=NOT(FALSE)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=OR(FALSE)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=AND(TRUE)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=FALSE()";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=TRUE()";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=VALUE(3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=LEN(\"hello\")";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=MID(\"hello\",1,1)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=ROUND(1,2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=SIGN(-2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=INT(3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=ABS(-3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=LN(2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=EXP(4)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=SQRT(2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=PI()";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=COS(4)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=SIN(3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=MAX(1,2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=MIN(1,2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=AVERAGE(1,2)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=SUM(1,3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=IF(1,2,3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=COUNT(1,2,3)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        nextFunction = "=SUBTOTAL(1,B3:C5)";
        worksheet.Cells[rowIndex, 0].Formula = nextFunction;
        worksheet.Cells[rowIndex++, 1].Value = nextFunction;

        // Paranthless checks.
        worksheet.Cells[++rowIndex, 0].Value = "Paranthless:";
        worksheet.Cells[rowIndex, 1].Formula = "=((12+2343+34545))";

        // Unary operators.
        worksheet.Cells[++rowIndex, 0].Value = "Unary operators:";
        worksheet.Cells[rowIndex, 1].Formula = "=B5%";
        worksheet.Cells[rowIndex, 2].Formula = "=+++B5";

        // Operand tokens, bool.
        worksheet.Cells[++rowIndex, 0].Value = "Bool values:";
        worksheet.Cells[rowIndex, 1].Formula = "=TRUE";
        worksheet.Cells[rowIndex, 2].Formula = "=FALSE";

        // Operand tokens, int.
        worksheet.Cells[++rowIndex, 0].Value = "Integer values:";
        worksheet.Cells[rowIndex, 1].Formula = "=1";
        worksheet.Cells[rowIndex, 2].Formula = "=20";

        // Operand tokens, num.
        worksheet.Cells[++rowIndex, 0].Value = "Float values:";
        worksheet.Cells[rowIndex, 1].Formula = "=.4";
        worksheet.Cells[rowIndex, 2].Formula = "=2235.5132";

        // Operand tokens, str.
        worksheet.Cells[++rowIndex, 0].Value = "String values:";
        worksheet.Cells[rowIndex, 1].Formula = "=\"hello world!\"";

        // Operand tokens, error.
        worksheet.Cells[++rowIndex, 0].Value = "Error values:";
        worksheet.Cells[rowIndex, 1].Formula = "=#NULL!";
        worksheet.Cells[rowIndex, 2].Formula = "=#DIV/0!";

        // Binary operators.
        worksheet.Cells[++rowIndex, 0].Value = "Binary operators:";
        worksheet.Cells[rowIndex, 1].Formula = "=(1)-(2)+(3/2+34)/2+12232-32-4";

        workbook.Save("Formula.%OutputFileType%");
    }
}

Imports GemBox.Spreadsheet

Module Program

    Sub Main()

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

        Dim workbook = New ExcelFile
        Dim worksheet = workbook.Worksheets.Add("Formula")

        Dim rowIndex As Integer = 0

        worksheet.Columns(0).Width = 35 * 256
        worksheet.Columns(1).Width = 15 * 256
        worksheet.Columns(2).Width = 15 * 256

        worksheet.Cells(rowIndex, 0).Value = "Examples of typical formulas usage:"
        rowIndex = rowIndex + 2

        worksheet.Cells(rowIndex, 0).Value = "Some data:"
        worksheet.Cells(rowIndex, 1).SetValue(3)
        worksheet.Cells(rowIndex, 2).SetValue(4.1)
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 1).SetValue(5.2)
        worksheet.Cells(rowIndex, 2).SetValue(6)
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 1).SetValue(7)
        worksheet.Cells(rowIndex, 2).SetValue(8.3)
        rowIndex = rowIndex + 1

        ' Named ranges.
        Dim namedRange As String = "Range1"
        worksheet.NamedRanges.Add(namedRange, worksheet.Cells.GetSubrange("B3", "C4"))

        ' Floats without first digit.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Float number without first digit:"
        worksheet.Cells(rowIndex, 1).Formula = "=.5/23+.1-2"

        ' Function using named range.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Named range:"
        worksheet.Cells(rowIndex, 1).Formula = "=SUM(" + namedRange + ")"

        ' Function's miss argument.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Function's miss arguments:"
        worksheet.Cells(rowIndex, 1).Formula = "=Count(1,  ,  ,,,2, 23,,,,,, 34,,,54,,,,  ,)"

        ' Functions are case-insensitive.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Functions are case-insensitive:"
        worksheet.Cells(rowIndex, 1).Formula = "=cOs( 1 )"

        ' Functions.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Supported functions:"

        Dim nextFunction As String
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Results"
        worksheet.Cells(rowIndex, 1).Value = "Formulas"
        rowIndex = rowIndex + 1

        nextFunction = "=NOW()+123"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=SECOND(12)/23"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=MINUTE(24)-1343/35"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=(HOUR(56)-23/35)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=WEEKDAY(5)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=YEAR(23)-WEEKDAY(5)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=MONTH(3)-2342/235345"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=((DAY(1)))"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=TIME(1,2,3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=DATE(1,2,3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=RAND()"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=TEXT(""text"", ""$d"")"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=VAR(1,2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=MOD(1,2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=NOT(FALSE)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=OR(FALSE)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=AND(TRUE)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=FALSE()"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=TRUE()"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=VALUE(3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=LEN(""hello"")"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=MID(""hello"",1,1)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=ROUND(1,2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=SIGN(-2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=INT(3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=ABS(-3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=LN(2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=EXP(4)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=SQRT(2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=PI()"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=COS(4)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=SIN(3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=MAX(1,2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=MIN(1,2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=AVERAGE(1,2)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=SUM(1,3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=IF(1,2,3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=COUNT(1,2,3)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        nextFunction = "=SUBTOTAL(1,B3:C5)"
        worksheet.Cells(rowIndex, 0).Formula = nextFunction
        worksheet.Cells(rowIndex, 1).Value = nextFunction
        rowIndex = rowIndex + 1

        ' Paranthless checks.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Paranthless:"
        worksheet.Cells(rowIndex, 1).Formula = "=((12+2343+34545))"

        ' Unary operators.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Unary operators:"
        worksheet.Cells(rowIndex, 1).Formula = "=B5%"
        worksheet.Cells(rowIndex, 2).Formula = "=+++B5"

        ' Operand tokens, bool.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Bool values:"
        worksheet.Cells(rowIndex, 1).Formula = "=TRUE"
        worksheet.Cells(rowIndex, 2).Formula = "=FALSE"

        ' Operand tokens, int.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Integer values:"
        worksheet.Cells(rowIndex, 1).Formula = "=1"
        worksheet.Cells(rowIndex, 2).Formula = "=20"

        ' Operand tokens, num.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Float values:"
        worksheet.Cells(rowIndex, 1).Formula = "=.4"
        worksheet.Cells(rowIndex, 2).Formula = "=2235.5132"

        ' Operand tokens, str.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "String values:"
        worksheet.Cells(rowIndex, 1).Formula = "=""hello world!"""

        ' Operand tokens, error.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Error values:"
        worksheet.Cells(rowIndex, 1).Formula = "=#NULL!"
        worksheet.Cells(rowIndex, 2).Formula = "=#DIV/0!"

        ' Binary operators.
        rowIndex = rowIndex + 1
        worksheet.Cells(rowIndex, 0).Value = "Binary operators:"
        worksheet.Cells(rowIndex, 1).Formula = "=(1)-(2)+(3/2+34)/2+12232-32-4"

        workbook.Save("Formula.%OutputFileType%")
    End Sub
End Module

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If you want to try the GemBox.Spreadsheet yourself, you can download the free version. It delivers the same performance and set of features as the professional version, but with some operations limited. To remove the limitation, you need to purchase a license.