Assembly: Microsoft.Office.Interop.Excel (in microsoft.office.interop.excel.dll)
This property is not available for OLAP data sources.
If the cell contains a constant, this property returns the constant. If the cell is empty, this Formula property returns an empty string. If the cell contains a formula, the Formula property returns the formula as a string in the same format that would be displayed in the formula bar (including the equal sign).
If you set the value or formula of a cell to a date, Microsoft Excel checks to see whether that cell is already formatted with one of the date or time number formats. If not, Microsoft Excel changes the number format to the default short date number format.
If the range is a one- or two-dimensional range, you can set the formula to an array of the same dimensions. Similarly, you can put the formula into a Basic array.
Setting the formula for a multiple-cell range fills all cells in the range with the formula.