Sets or returns a cell value.  Empty cells will return either null or empty string.

 public System.Object Value{ get; set; }
Public Property Value() As Object

          //--- Get Value
          Object cellValue = cellA1.Value;

          //--- Set Value
          cellA1.Value = "value";
        

          '--- Get Value
          Dim cellValue As Object = cellA1.Value

          '--- Set Value
          cellA1.Value = "value"