ComboBox SpreadsheetGear API Sample

// Create a new workbook and get a reference to the active worksheet, cells and 
// window info.
SpreadsheetGear.IWorkbook workbook =  SpreadsheetGear.Factory.GetWorkbook();
SpreadsheetGear.IWorksheet worksheet = workbook.ActiveWorksheet;
SpreadsheetGear.IRange cells = worksheet.Cells;
SpreadsheetGear.IWorksheetWindowInfo windowInfo = worksheet.WindowInfo;

// Populate some cells which will be linked to from the ComboBox.
cells["A50"].Value = "January";
cells["A51"].Value = "February";
cells["A52"].Value = "March";
cells["A53"].Value = "April";
cells["A54"].Value = "May";
cells["A55"].Value = "June";
cells["A56"].Value = "July";
cells["A57"].Value = "August";
cells["A58"].Value = "September";
cells["A59"].Value = "October";
cells["A60"].Value = "November";
cells["A61"].Value = "December";

// Calculate the left, top, width and height of the ComboBox by 
// converting row and column coordinates to points.  Use fractional 
// values to get coordinates in between row and column boundaries.
double left = windowInfo.ColumnToPoints(1.1);
double top = windowInfo.RowToPoints(1.4);
double right = windowInfo.ColumnToPoints(2.9);
double bottom = windowInfo.RowToPoints(2.6);
double width = right - left;
double height = bottom - top;

// Add the ComboBox using the calculated bounds.
SpreadsheetGear.Shapes.IShape shape =
    worksheet.Shapes.AddFormControl(
    SpreadsheetGear.Shapes.FormControlType.DropDown,
    left, top, width, height);

// Get a reference to the control format.
SpreadsheetGear.Shapes.IControlFormat controlFormat = shape.ControlFormat;

// Fill the ComboBox with a range of existing values.
controlFormat.ListFillRange = "A50:A61";

// Link the ComboBox to cell A2.
controlFormat.LinkedCell = "A2";

// Set the number of items to display when the control is dropped down.
controlFormat.DropDownLines = controlFormat.ListCount;

// Select the first item in the list.
controlFormat.ListIndex = 0;