How to convert Legacy XLS to CSV in C# .NET Framework

There are few things more irritating than outdated file formats, but somehow they are still a commonplace occurrence. The best way to deal with them is to convert into something a little more useful, CSV for example. This is by no means simple to perform from scratch, which is why today’s tutorial will demonstrate how to make this happen in just a few minutes, with minimal setup requirements.

First we grab our package using the NuGet console.

Install-Package Cloudmersive.APIClient.NET.DocumentAndDataConvert -Version 3.2.8

And next we call our function:

using System;
using System.Diagnostics;
using Cloudmersive.APIClient.NET.DocumentAndDataConvert.Api;
using Cloudmersive.APIClient.NET.DocumentAndDataConvert.Client;
using Cloudmersive.APIClient.NET.DocumentAndDataConvert.Model;
namespace Example
{
public class ViewerToolsCreateSimpleExample
{
public void main()
{
// Configure API key authorization: Apikey
Configuration.Default.AddApiKey("Apikey", "YOUR_API_KEY");
// Uncomment below to setup prefix (e.g. Bearer) for API key, if needed
// Configuration.Default.AddApiKeyPrefix("Apikey", "Bearer");
var apiInstance = new ViewerToolsApi();
var inputFile = new System.IO.Stream(); // System.IO.Stream | Input file to perform the operation on.
try
{
// Create a web-based viewer
ViewerResponse result = apiInstance.ViewerToolsCreateSimple(inputFile);
Debug.WriteLine(result);
}
catch (Exception e)
{
Debug.Print("Exception when calling ViewerToolsApi.ViewerToolsCreateSimple: " + e.Message );
}
}
}
}

And done! No more XLS woes.