Parameters in "cells"-method - vb.net

Question

I'm new in VB.NET. I want to export Excel from VB.NET, and I'm using EPPlus for my project.
What are the four parameters of ws.cells() in this code?
Code:
Imports OfficeOpenXml
Imports OfficeOpenXml.Style
Imports System.IO
Public Class excelExport
Private Access As New DBControl
Public Sub myReport()
Dim saveDialog As New SaveFileDialog
saveDialog.Filter = "Excel File (*.xlsx)|*.xlsx"
saveDialog.FilterIndex = 1
If saveDialog.ShowDialog() = DialogResult.OK Then
Try
Dim file As FileInfo = New FileInfo(saveDialog.FileName)
' Ensures we create a new workbook
If (file.Exists) Then
file.Delete()
End If
Dim pck As ExcelPackage = New ExcelPackage(file)
' Add a new worksheet to the empty workbook
Dim ws As ExcelWorksheet = pck.Workbook.Worksheets.Add("Sheet1")
' Load data from DataTable to the worksheet
ws.Cells("A1").Value = "new"
ws.Cells.AutoFitColumns()
' Add some styling
Dim rng As ExcelRange = ws.Cells(1, 1, 1, 10) '<---------- This code
rng.Style.Font.Bold = True
rng.Style.Fill.PatternType = ExcelFillStyle.Solid
rng.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.FromArgb(79, 129, 189))
rng.Style.Font.Color.SetColor(System.Drawing.Color.White)
' Save the new workbook
pck.Save()
MessageBox.Show(String.Format("Excel file {0} generated successfully.", file.Name))
Catch ex As Exception
MessageBox.Show("Failed to export to Excel. Original error: " + ex.Message)
End Try
End If
End Sub
End Class

Answer 1

Your first question is mainly asking for an opinion, which is not what this site is for. For what it is worth, I have found EPPlus useful for creating Excel files.
The answer to your second question is that the four arguments in the Cells method are:
The number of the first row to be included in the Range.
The number of the first column to be included in the Range.
The number of the last row to be included in the Range.
The number of the last column to be included in the Range.