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ExcelApplication supports all math, string, boolean, time, statistical, database, lookup and reference formulas or functions that are part of Excel. ExcelWriter does not calculate formulas at run-time; all formulas are calculated when the workbook is opened in Excel. |

To insert a formula in a cell, use the propertyCell.Formula. Begin the formula string with =, as you would when entering a formula in Microsoft Excel:

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The property Cell.Name returns a cell's Excel-style name (e.g., "B5"). This property can be useful if you want to build a formula string using row and column indexes, rather than cell names, for example:

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```
String formula = "=SUM(" + sheet1.Cells[3, 1].Name +
":" + sheet1.Cells[23, 1].Name + ")";
sheet1.Cells[24, 1].Formula = formula;
``` |

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Here is an example that demonstrates how to use Formulas with ExcelApplication:

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```
//--- Create ExcelApplication, a Workbook, and a Worksheet
ExcelApplication xlw = new ExcelApplication();
Workbook wb = xlw.Create(ExcelApplication.FileFormat.Xlsx);
Worksheet sheet1 = wb.Worksheets[0];
//--- Write some values into cells for the
//--- formulas to compute
sheet1.Cells["A1"].Value = 1;
sheet1.Cells["A2"].Value = 2;
sheet1.Cells["A3"].Value = 3;
//--- Write a formula into a cell
//--- Formula will be calculated
//--- when opened in Excel
sheet1.Cells["A4"].Formula = "=SUM(A1:A3)";
//--- Save the workbook
xlw.Save(wb, "Generated.xlsx");
``` |

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