How can I bold the fonts of a specific row or cell in an Excel worksheet with C#?

Question

I am exporting data from a List<> to excel. I want to make some specific rows and cells bold. I need to make some cell merged also.

Below is the code I am using.

try
        {
            Excel.Application application;
            Excel.Workbook workBook;
            Excel.Worksheet workSheet;
            object misValue = System.Reflection.Missing.Value;

            application = new Excel.ApplicationClass();
            workBook = application.Workbooks.Add(misValue);
            workSheet = (Excel.Worksheet)workBook.Worksheets.get_Item(1);

            int i = 1;
            workSheet.Cells[i, 2] = "MSS Close Sheet";                
            i++;
            workSheet.Cells[i, 2] = "MSS - " + dpsNoTextBox.Text;
            i++;
            workSheet.Cells[i, 2] = customerNameTextBox.Text;
            i++;                
            workSheet.Cells[i, 2] = "Opening Date : ";
            workSheet.Cells[i, 3] = openingDateTextBox.Value.ToShortDateString();
            i++;
            workSheet.Cells[i, 2] = "Closing Date : ";
            workSheet.Cells[i, 3] = closingDateTextBox.Value.ToShortDateString();
            i++;
            i++;
            i++;

            workSheet.Cells[i, 1] = "SL. No";
            workSheet.Cells[i, 2] = "Month";
            workSheet.Cells[i, 3] = "Amount Deposited";
            workSheet.Cells[i, 4] = "Fine";
            workSheet.Cells[i, 5] = "Cumulative Total";
            workSheet.Cells[i, 6] = "Profit + Cumulative Total";
            workSheet.Cells[i, 7] = "Profit @ " + profitRateComboBox.Text;
            i++;



            /////////////////////////////////////////////////////////
            foreach (RecurringDeposit rd in RecurringDepositList)
            {
                workSheet.Cells[i, 1] = rd.SN.ToString();
                workSheet.Cells[i, 2] = rd.MonthYear;
                workSheet.Cells[i, 3] = rd.InstallmentSize.ToString();
                workSheet.Cells[i, 4] = "";
                workSheet.Cells[i, 5] = rd.CumulativeTotal.ToString();
                workSheet.Cells[i, 6] = rd.ProfitCumulative.ToString();
                workSheet.Cells[i, 7] = rd.Profit.ToString();
                i++;
            }
            //////////////////////////////////////////////////////


            ////////////////////////////////////////////////////////
            workSheet.Cells[i, 2] = "Total (" + RecurringDepositList.Count + " months installment)";
            workSheet.Cells[i, 3] = totalAmountDepositedTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "a) Total Amount Deposited";
            workSheet.Cells[i, 3] = totalAmountDepositedTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "b) Fine";
            workSheet.Cells[i, 3] = "";
            i++;

            workSheet.Cells[i, 2] = "c) Total Pft Paid";
            workSheet.Cells[i, 3] = totalProfitPaidTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "Sub Total";
            workSheet.Cells[i, 3] = (totalAmountDepositedTextBox.Value + totalProfitPaidTextBox.Value).ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "Deduction";
            i++;

            workSheet.Cells[i, 2] = "a) Excise Duty";
            workSheet.Cells[i, 3] = "0";
            i++;

            workSheet.Cells[i, 2] = "b) Income Tax on Pft. @ " + incomeTaxPercentageTextBox.Text;
            workSheet.Cells[i, 3] = "0";
            i++;

            workSheet.Cells[i, 2] = "c) Account Closing Charge ";
            workSheet.Cells[i, 3] = closingChargeCommaNumberTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "d) Outstanding on BAIM(FO) ";
            workSheet.Cells[i, 3] = baimFOLowerTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "Total Deduction ";
            workSheet.Cells[i, 3] = (incomeTaxDeductionTextBox.Value + closingChargeCommaNumberTextBox.Value + baimFOTextBox.Value).ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "Client Paid ";
            workSheet.Cells[i, 3] = customerPayableNumberTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "e) Current Balance ";
            workSheet.Cells[i, 3] = currentBalanceCommaNumberTextBox.Value.ToString("0.00");
            workSheet.Cells[i, 5] = "Exp. Pft paid on MSS A/C(PL67054)";
            workSheet.Cells[i, 6] = plTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "e) Total Paid ";
            workSheet.Cells[i, 3] = customerPayableNumberTextBox.Value.ToString("0.00");
            workSheet.Cells[i, 5] = "IT on Pft (BDT16216)";
            workSheet.Cells[i, 6] = incomeTaxDeductionTextBox.Value.ToString("0.00");
            i++;

            workSheet.Cells[i, 2] = "Difference";
            workSheet.Cells[i, 3] = (currentBalanceCommaNumberTextBox.Value - customerPayableNumberTextBox.Value).ToString("0.00");
            workSheet.Cells[i, 5] = "Account Closing Charge";
            workSheet.Cells[i, 6] = closingChargeCommaNumberTextBox.Value;
            i++;

            ///////////////////////////////////////////////////////////////

            workBook.SaveAs("D:\\" + dpsNoTextBox.Text.Trim() + "-" + customerNameTextBox.Text.Trim() + ".xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
            workBook.Close(true, misValue, misValue);
            application.Quit();

            releaseObject(workSheet);
            releaseObject(workBook);
            releaseObject(application);

The sheet should look like this:

Answer 1

How to Bold entire row 10 example:

workSheet.Cells[10, 1].EntireRow.Font.Bold = true;    

---

More formally:

Microsoft.Office.Interop.Excel.Range rng = workSheet.Cells[10, 1] as Xl.Range;
rng.EntireRow.Font.Bold = true;

---

How to Bold Specific Cell 'A10' for example:

workSheet.Cells[10, 1].Font.Bold = true;

---

Little more formal:

int row = 1;
int column = 1;  /// 1 = 'A' in Excel

Microsoft.Office.Interop.Excel.Range rng = workSheet.Cells[row, column] as Xl.Range;
rng.Font.Bold = true;