var wb = new XLWorkbook();

var ws = wb.Worksheets.Add("Contacts");

// Title
ws.Cell("B2").Value = "Contacts";

// First Names
ws.Cell("B3").Value = "FName";
ws.Cell("B4").Value = "John";
ws.Cell("B5").Value = "Hank";
ws.Cell("B6").Value = "Dagny";

// Last Names
ws.Cell("C3").Value = "LName";
ws.Cell("C4").Value = "Galt";
ws.Cell("C5").Value = "Rearden";
ws.Cell("C6").Value = "Taggart";

// Boolean
ws.Cell("D3").Value = "Outcast";
ws.Cell("D4").Value = true;
ws.Cell("D5").Value = false;
ws.Cell("D6").Value = false;

// DateTime
ws.Cell("E3").Value = "DOB";
ws.Cell("E4").Value = new DateTime(1919, 1, 21);
ws.Cell("E5").Value = new DateTime(1907, 3, 4);
ws.Cell("E6").Value = new DateTime(1921, 12, 15);

// Numeric
ws.Cell("F3").Value = "Income";
ws.Cell("F4").Value = 2000;
ws.Cell("F5").Value = 40000;
ws.Cell("F6").Value = 10000;

// From worksheet
var rngTable = ws.Range("B2:F6");

// From another range
var rngDates = rngTable.Range("D3:D5"); // The address is relative to rngTable (NOT the worksheet)
var rngNumbers = rngTable.Range("E3:E5"); // The address is relative to rngTable (NOT the worksheet)

// Using OpenXML's predefined formats
rngDates.Style.NumberFormat.NumberFormatId = 15;

// Using a custom format
rngNumbers.Style.NumberFormat.Format = "$ #,##0";

var rngHeaders = rngTable.Range("A2:E2"); // The address is relative to rngTable (NOT the worksheet)
rngHeaders.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
rngHeaders.Style.Font.Bold = true;
rngHeaders.Style.Fill.BackgroundColor = XLColor.Aqua;

rngTable.Style.Border.BottomBorder = XLBorderStyleValues.Thin;

rngTable.Cell(1, 1).Style.Font.Bold = true;
rngTable.Cell(1, 1).Style.Fill.BackgroundColor = XLColor.CornflowerBlue;
rngTable.Cell(1, 1).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;

rngTable.Row(1).Merge(); // We could've also used: rngTable.Range("A1:E1").Merge()

//Add a thick outside border
rngTable.Style.Border.OutsideBorder = XLBorderStyleValues.Thick;

// You can also specify the border for each side with:
// rngTable.FirstColumn().Style.Border.LeftBorder = XLBorderStyleValues.Thick;
// rngTable.LastColumn().Style.Border.RightBorder = XLBorderStyleValues.Thick;
// rngTable.FirstRow().Style.Border.TopBorder = XLBorderStyleValues.Thick;
// rngTable.LastRow().Style.Border.BottomBorder = XLBorderStyleValues.Thick;

ws.Columns(2, 6).AdjustToContents();

wb.SaveAs("BasicTable.xlsx");