How to format heading in excel / csv using C#

Question

My code will generate the excel document like this

|id  | Name  | Address  | company_Name | Destination|
|----|-------|----------|--------------|------------|
|##1 | xxx   | xxxx     | xxx          | xxxxx      |

But I want like this...

-----------------------------------------------------
| Personal Information  |   Working INFO            |
-----------------------------------------------------
|id  | Name  | Address  | company_Name | Destination|
|----|-------|----------|--------------|------------|
|##1 | xxx   | xxxx     | xxx          | xxxxx      |
-----------------------------------------------------

I get the data from the API and I will save it using the SaveFileDialog

SaveFileDialog dialog = new SaveFileDialog();
dialog.Title = "Save file as...";
dialog.Filter = "Text files (*.csv)|*.csv";
dialog.RestoreDirectory = true;

if (dialog.ShowDialog() == DialogResult.OK)
{
     System.IO.StreamWriter writer = new System.IO.StreamWriter(dialog.FileName); //open the file for writing.
     writer.Write(report); //write the current date to the file. change this with your date or something.
     writer.Close(); //remember to close the file again.
     writer.Dispose(); //remember to dispose it from the memory.

     program.ShowInformationMessage("File Save successfully");
}

There is no problem with it.

I want to make the heading as the inline something like it.

Answer 1

...
System.IO.StreamWriter writer = new System.IO.StreamWriter(dialog.FileName); //open the file for writing.
writer.Write("Personal Information" + delimiter + delimiter + "Working INFO" + delimiter);
writer.Write(report); //write the current date to the file. change this with your date or something.
...

Csv format doesn't support merged cells, but still you can arrange header line like described above. Just replace delimiter with whatever your cell delimiter is.

Answer 2

Have you considered using closedxml (https://closedxml.codeplex.com/).

 var wb = new XLWorkbook(report); //open spreadsheet
 IXLWorksheet ws = wb.Worksheets.First(); //get first sheet
 ws.Row(1).InsertRowsAbove(1); //insert row
 ws.Cell("A1").Value = "Personal Information";
 ws.Cell("A4").Value = " Working INFO";
 ws.Range("A1:A3").Row(1).Merge(); // merge first title
 ws.Range("A4:A6").Row(1).Merge(); // merge second
 wb.SaveAs(writer);

You can also open csv's and save as csv