Spread for WinForms allows you to display the formula in a cell instead of its final calculated value. The DisplayFormulas property in IWorksheetView interface can be used to enable or disable the display of cell formulas. By default, it is set to false. The DisplayFormulas property is set at the worksheet level. Hence, the other worksheets are not impacted by the value of any particular sheet.
When DisplayFormulas is set to true, the column widths are doubled to display the long formulas in cells conveniently. However when set to false, the column widths are restored to their original width.
This example code sets the DisplayFormulas property to true to display the formula in cell C1.
C# 
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// Set value in Cells fpSpread1.ActiveSheet.Cells["A1"].Value = 10; fpSpread1.ActiveSheet.Cells["B1"].Value = 20; // Set formula in Cell fpSpread1.ActiveSheet.Cells["C1"].Formula = "SUM(A1, B1)"; // Set DisplayFormula to true for the activeSheet fpSpread1.AsWorkbook().ActiveSheet.View.DisplayFormulas = true; 
VB 
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' Set value in Cells fpSpread1.ActiveSheet.Cells("A1").Value = 10 fpSpread1.ActiveSheet.Cells("B1").Value = 20 ' Set formula in Cell fpSpread1.ActiveSheet.Cells("C1").Formula = "SUM(A1, B1)" ' Set DisplayFormula to true for the activeSheet fpSpread1.AsWorkbook().ActiveSheet.View.DisplayFormulas = True 
To enable 'Show Formulas' option in Spread Designer, click on the 'Show Formulas' option in Formulas tab. The "Show Formulas" button is grayed when the mode is already enabled.