C# Экспорт DataGridView в Excel

Устанавливаем o2007pia.msi, в проекте, через AddReference добавляем COM-объект "Microsoft Excel 12 Object Library":

using Microsoft.Office.Interop.Excel;

...

private void btnSaveXls_Click(object sender, EventArgs e)
{
    // creating Excel Application
    Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();

    // creating new WorkBook within Excel application  
    Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);

    // creating new Excelsheet in workbook  
    Microsoft.Office.Interop.Excel._Worksheet worksheet = null;

    // see the excel sheet behind the program
    app.Visible = true;    
    // store its reference to worksheet
    worksheet = (Worksheet)workbook.ActiveSheet;

    // changing the name of active sheet
    worksheet.Name = "Exported from gridview";

    // storing header part in Excel
    for (int i = 1; i < dgvV.Columns.Count + 1; i++)
    {
        worksheet.Cells[1, i] = dgvV.Columns[i - 1].HeaderText;
    }

    worksheet.get_Range("A1").AutoFit(); 
    worksheet.get_Range("B1").AutoFit();
    worksheet.get_Range("C1").AutoFit();

    // storing Each row and column value to excel sheet
    for (int i = 0; i < dgvV.Rows.Count - 1; i++)
    {
        for (int j = 0; j < dgvV.Columns.Count; j++)
        {
            worksheet.Cells[i + 2, j + 1] = dgvV.Rows[i].Cells[j].Value.ToString();
        }
    }

    // save the application
    workbook.SaveAs("c:\\output.xlsx", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

    // Exit from the application
    app.Quit();
}