"The remote host closed the connection" error for HttpResponse.Write

I've inherited an old website that has a feature for downloading an excel document of user records. The following code is causing a "The remote host closed the connection. The error code is 0x800704CD. " error:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

namespace MySite.ApplicationServices
{
public class OutputFileWriter : IDisposable
{
    private HttpResponse _response;
    private bool _isResponsePrepared;

    public OutputFileWriter(HttpResponse response)
    {
        this._response = response;
    }

    public OutputFileWriter(HttpResponse response, string outputFileName)
        : this(response)
    {
        this.OutputFileName = outputFileName;
    }

    public string OutputFileName { get; set; }

    public virtual void WriteLine(string line)
    {
        if (this._response == null)
            throw new ObjectDisposedException("OutputFileWriter");

        if (!this._isResponsePrepared)
        {
            this.PrepareResponse();
            this._isResponsePrepared = true;
        }

        this._response.Write(line);
    }

    public virtual void Dispose()
    {
        if (this._response != null)
        {
            this._response.Flush();
            this._response.Close();
            this._response = null;
        }
    }

    protected virtual void PrepareResponse()
    {
        if (string.IsNullOrEmpty(this.OutputFileName))
            throw new InvalidOperationException("An output file name is required.");

        this._response.Clear();
        this._response.ContentType = "application/octet-stream";
        this._response.Buffer = this._response.BufferOutput = false;
        this._response.AppendHeader("Cache-Control", "no-store, no-cache");
        this._response.AppendHeader("Expires", "-1");
        this._response.AppendHeader("Content-disposition", "attachment; filename=" + this.OutputFileName);
    }
}
} 

Here's an example of the code that calls it (on clicking a 'Download' button):

 using (OutputFileWriter writer = new OutputFileWriter(this.Response, "users.xls"))
            {
                foreach (string result in searchResults)
                {
                    writer.WriteLine(result);
                }
            }

The error occurs even after just a few bytes downloaded. I'm aware that the error can occur under normal circumstances if a client cancels the download, but it is happening when people don't cancel too. The connection is being lost I presume, but I'm not sure why.

In case it's relevant, the site is configured in IIS 7 with Integrated App pool under .NET 2.0. It is also load balanced.

Any thoughts?

After some further investigation, it seems the file could in fact be downloaded in Firefox only.

The following post suggested changing from _response.Close() to _response.End() might work https://productforums.google.com/forum/#!topic/chrome/8Aykgxa8kWU, which it did.

However, I then saw this HttpResponse.End vs HttpResponse.Close vs HttpResponse.SuppressContent

So I'm now calling CompleteRequest() on the HttpApplication instance. Like this:

Old method

public virtual void Dispose()
{
    if (this._response != null)
    {
        this._response.Flush();
        this._response.Close();
        this._response = null;
    }
}

New method:

public virtual void Dispose()
{
    if (this._response != null)
    {
        this._response.Flush();
        this._application.CompleteRequest();
        this._response = null;
    }
}

This is now working fine.