VSTO

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Excel;
namespace VSTO
{public partial class ThisAddIn{private void ThisAddIn_Startup(object sender, System.EventArgs e){//Instantiate the Application objectExcel.Application ExcelApp = Application;//Add a WorkbookExcel.Workbook workbook = ExcelApp.Workbooks.Add();//Get the First sheetExcel.Worksheet sheet = (Excel.Worksheet)workbook.Sheets["Sheet1"];//Merge A1-B5 to one cellsheet.get_Range("A1", "B5").Merge();//Save the fileworkbook.SaveAs("MergedCells.xlsx");}private void ThisAddIn_Shutdown(object sender, System.EventArgs e){}#region VSTO generated code/// <summary>/// Required method for Designer support - do not modify/// the contents of this method with the code editor./// </summary>private void InternalStartup(){this.Startup += new System.EventHandler(ThisAddIn_Startup);this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);}#endregion}
}

Spire.XLS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Spire.Xls;namespace Spire.XLS
{class Program{static void Main(string[] args){//Initialize a new instance of workbookWorkbook workbook = new Workbook();//Get the first worksheetWorksheet sheet = workbook.Worksheets[0];//Merge A1-B5 to one cellsheet.Range["A1:B5"].Merge();//Save and Launchworkbook.SaveToFile("MergedCells.xlsx", ExcelVersion.Version2010);System.Diagnostics.Process.Start("MergedCells.xlsx");}}}

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