How to mail merge into more that one specific merge field

Good Day

I want to apply mail merge to a document which have 4 name, surname and birthday fields.
The reason why I did this is to save paper.
How can I use a loop to print each merge field with a different row in the data source.

I have uploaded an example to make it more clear

Thanks in advance

Hi Johnane,

Thanks for your inquiry. I have attached a modified version of your template document and please use the following code to meet this requirement:

Document doc = new Document(MyDir + @"Merge example-modified.docx");
doc.MailMerge.MergeDuplicateRegions = true;
doc.MailMerge.UseWholeParagraphAsRegion = false; 
doc.Save(MyDir + @"16.1.0.docx");
private static DataTable GetDataTable()
    DataTable dataTable = new DataTable("tbl");
    dataTable.Columns.Add(new DataColumn("Name"));
    dataTable.Columns.Add(new DataColumn("Surname"));
    dataTable.Columns.Add(new DataColumn("Birthday"));
    DataRow dataRow;
    for (int i = 0; i < 4; i++)
        dataRow = dataTable.NewRow();
        dataRow[0] = "Johnane" + i;
        dataRow[1] = "Umslana" + i;
        dataRow[2] = DateTime.Now.ToString("dd/MMM/yyyy") + i;
    return dataTable;

Hope, this helps.

Best regards,