How to hide Excel Columns and Rows using Interop C#

Question

I have made a simple inventory interface that will take data from access and show in datagrid view on my interface and then send the information to Excel via button click. This part works as needed but I would like to remove the unused columns and rows after the information is sent. I am currently using VS 2015. I cant figure out what to add to accomplish this.

//send to excel
    private void btnExport_Click(object sender, EventArgs e)
    {
        ActiveControl = txtSerial;
        // 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;

        // get the reference of first sheet. By default its name is Sheet1.
        // store its reference to worksheet
        worksheet = workbook.Sheets["Sheet1"];
        worksheet = workbook.ActiveSheet;

        // changing the name of active sheet
        worksheet.Name = "Inventory Search";

        // storing header part in Excel
        for (int i = 1; i < dataGridFB.Columns.Count + 1; i++)
        {
            worksheet.Cells[1, i] = dataGridFB.Columns[i - 1].HeaderText;
            worksheet.Cells[1, i].Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.LightBlue);
            worksheet.Cells[1, i].Font.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Black);
            worksheet.Cells[1, i].HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
            worksheet.Cells[1, i].Font.Size = 14;
        }

        // storing Each row and column value to excel sheet
        for (int i = 0; i < dataGridFB.Rows.Count - 1; i++)
        {
            for (int j = 0; j < dataGridFB.Columns.Count; j++)
            {
                worksheet.Cells[i + 2, j + 1] = dataGridFB.Rows[i].Cells[j].Value.ToString();
                worksheet.Cells[i + 2, j + 1].HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
                worksheet.Cells[i + 2, j + 1].Font.Size = 12;
                worksheet.Columns["A:G"].AutoFit();
            }
        }
    }

Answer 1

Your question is a bit too broad, thus the answer is generic: in order to delete entire Worksheet Column you may use VBA statement like: Columns("C").Delete, or Columns(3).EntireColumn.Delete, or Columns("F:K").Delete. Similar syntax may apply to: Rows(3).Delete.

In order to just hide Rows/Columns use the VBA statement like shown below:

Rows("3:10").EntireRow.Hidden = True
Columns("C").Hidden = True

Hope this may help.