CheckBox SpreadsheetGear API Sample

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

// Calculate the left, top, width and height of the checkbox 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(1.1);
double right = windowInfo.ColumnToPoints(3.9);
double bottom = windowInfo.RowToPoints(2.9);
double width = right - left;
double height = bottom - top;

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

// Link the checkbox to cell A2.
shape.ControlFormat.LinkedCell = "A2";

// Set the text of the checkbox.
shape.TextFrame.Characters.Text = "Click Here to Toggle Cell A2";