_Application.ThisCell property

Returns the cell the user-defined function is being called from as a Range object.

Namespace:  Microsoft.Office.Interop.Excel
Assembly:  Microsoft.Office.Interop.Excel (in Microsoft.Office.Interop.Excel.dll)

Range ThisCell { get; }

Users should not access properties or methods on the Range object when inside the user-defined function. Users can cache the Range object for later use and perform additional actions when the recalculation is finished.