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Here's an example code snippet that shows how to convert an IO.Stream to a MemoryStream and then save it as a PDF file in a local folder in C#:

using System.IO;
using System.Net;

public void SaveStreamAsPDF(Stream inputStream, string filePath)
{
    // Convert IO.Stream to MemoryStream
    MemoryStream memoryStream = new MemoryStream();
    inputStream.CopyTo(memoryStream);

    // Save MemoryStream as PDF file
    using (FileStream fileStream = new FileStream(filePath, FileMode.Create))
    {
        memoryStream.WriteTo(fileStream);
    }
}

In this example, the SaveStreamAsPDF method takes an IO.Stream object (which can be any type of input stream), and a string filePath that points to the location where the PDF file will be saved.

First, the method creates a MemoryStream object and copies the contents of the input stream into it using the CopyTo method. This converts the input stream into a memory stream that can be easily manipulated and written to disk.

Then, the method creates a FileStream that points to the specified filePath, and writes the contents of the memory stream to it using the WriteTo method. This saves the memory stream as a PDF file in the specified location on disk.

Note that this example assumes that you already have an input stream from which you want to create a PDF file. If you need help obtaining an input stream, you may need to provide more information about your specific use case.