// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// Accessing the reference of the worksheet that is currently active
GridWorksheet sheet = GridWeb1.WorkSheets[GridWeb1.ActiveSheetIndex];

// Merging cells starting from the cell with 3rd row and 3rd column. 
// 2 rows and 2 columns will be merged from the starting cell
sheet.Cells.Merge(2, 2, 2, 2);