Sets or returns an array entered formula. An array entered formula is a formula that can have multiple output values. To set an array entered formula, surround the formula string with a '{' and '}'.

 public System.String ArrayFormula{ get; set; }

Public Property ArrayFormula() As String

//--- Get ArrayFormula
string formula = a.ArrayFormula;

//--- Set ArrayFormula
Area a = ws.CreateArea(10,0,10,1);
a.ArrayFormula = "{=TREND(A1:A10,B1:B10)}";

'--- Get ArrayFormula
Dim formula As String = a.ArrayFormula

'--- Set ArrayFormula
Dim a As Area = ws.CreateArea(10,0,10,1)
a.ArrayFormula = "{=TREND(A1:A10,B1:B10)}"