[]
Gets or sets the reference of the current picture.
For a linked picture created from a cell range, the returned string identifies the source reference used by the picture.
string Reference { get; set; }
Property Reference As String
worksheet.Range["A1:B2"].Value = new object[,] {{"Name", "Value"}, {"Test", 100}};
IShape picture = worksheet.Shapes.AddCameraPicture("=$A$1:$B$2", 20, 20);
IPictureFormat pictureFormat = picture.PictureFormat;
string reference = pictureFormat.Reference;