How to convert Excel to PDF and fit each sheet to a single page in C# and .NET
Complete code
using System;
using System.IO;
using SautinSoft;
namespace Sample
{
    class Sample
    {
        static void Main(string[] args)
        {
			// Before starting, we recommend to get a free key:
            // https://sautinsoft.com/start-for-free/
            
            // Apply the key here:
			// SautinSoft.ExcelToPdf.SetLicense("...");
            // Fit each sheet to a single page fixed size.
            ExcelToPdf x = new ExcelToPdf();
            // Fit each sheet to single PDF page, A4 format.
            x.PageStyle.PageSize.A4();
            x.PageStyle.PageScale.Auto();
            // Set PDF as output format.
            x.OutputFormat = SautinSoft.ExcelToPdf.eOutputFormat.Pdf;
            string excelFile = Path.GetFullPath(@"..\..\..\test.xlsx");
            string pdfFile = Path.ChangeExtension(excelFile, ".pdf"); ;
            try
            {
                x.ConvertFile(excelFile, pdfFile);
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(pdfFile) { UseShellExecute = true });
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.ReadLine();
            }
        }
    }
}
Imports System
Imports System.IO
Imports SautinSoft
Module Sample
    Sub Main()
	
		' Before starting, we recommend to get a free key:
        ' https://sautinsoft.com/start-for-free/
            
        ' Apply the key here:
		' SautinSoft.ExcelToPdf.SetLicense("...");
        ' Fit each sheet to a single page fixed size.
        Dim x As New ExcelToPdf()
        'Fit each sheet to single PDF page, A4 format.
        x.PageStyle.PageSize.A4()
        x.PageStyle.PageScale.Auto()
        ' Set PDF as output format.
        x.OutputFormat = SautinSoft.ExcelToPdf.eOutputFormat.Pdf
        Dim excelFile As String = Path.GetFullPath("..\..\..\test.xlsx")
        Dim pdfFile As String = Path.ChangeExtension(excelFile, ".pdf")
        Try
            x.ConvertFile(excelFile, pdfFile)
            System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(pdfFile) With {.UseShellExecute = True})
        Catch ex As Exception
            Console.WriteLine(ex.Message)
            Console.ReadLine()
        End Try
    End Sub
End Module
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