c# - File Upload read to memory and use as text file - is there a better way?

Question

I have a intranet hosted web application where the user will upload a text file with space delimited data in 5 columns. I don't wish to save the file so I wanted to just use it in memory. I tried many different examples off the web and none worked. Finally a co-worker showed me how to do this. Here is the code and I'm wondering if there is a better way to do this. In the end, all I want is a way to link the data to a gridview or repeater for viewing and later storage into a database (SQL Server).

The upload file asp tag ID is SurveyFileUpload
The SurveyDate is an asp:input field

Int32 fileLen = SurveyFileUpload.PostedFile.ContentLength;

// Create a byte array to hold the contents of the file.
Byte[] buffer = new Byte[fileLen];

// Initialize the stream to read the uploaded file.
Stream s = SurveyFileUpload.FileContent;

// Read the file into the byte array.
s.Read(buffer, 0, fileLen);

// Convert byte array into characters.
ASCIIEncoding enc = new ASCIIEncoding();
string str = enc.GetString(buffer);
testReadFile(str, db_surveyDate.Text);

protected void testReadFile(string inFileString, string inSurveyDate)
{
    string[] lines = inFileString.Split('
');
    curFileListing.InnerHtml = "";
    int curRow = 1;
    var readings = from line in lines
       select new
       {
           // this is just for display purposes to show the number of rows on the page
           Row = curRow++,
           SurveyDate = inSurveyDate,
           ItemNumber = Regex.Split(line, "[ ]+")[0],
           Northing = Regex.Split(line, "[ ]+")[1],
           Easting = Regex.Split(line, "[ ]+")[2],
           Elevation = Regex.Split(line, "[ ]+")[3],
           Name = Regex.Split(line, "[ ]+")[4]
       };
    saveFileData.Visible = true;
    GridView fileData = new GridView();
    fileData.DataSource = readings;
    fileData.DataBind();
    fileData.AlternatingRowStyle.BackColor = 
           System.Drawing.ColorTranslator.FromHtml("#eee");
    curFileListing.Controls.Add(fileData);
}

This works OK. I'm not that knowledgeable with LINQ and I had a hard time with the file stream part.

Answer 1

I use this method. I am reading in id numbers from a text file with one id number per line:

if (fileUpload.HasFile)
{
    using (Stream fileStream = fileUpload.PostedFile.InputStream)
    using (StreamReader sr = new StreamReader(fileStream))
    {
        string idNum = null;
        while ((idNum = sr.ReadLine()) != null)
        {
            // Verify the line is in the expected id format
            if (Regex.IsMatch(idNum, this.InputRegex))
            {
                // Do Stuff with input
            }
            else
            {
                Log.LogDebug("{0}Invalid input format.", LoggingSettings.logPrefix);
            }
        }
    }

}
else
{
    Log.LogDebug("{0}No file present.", LoggingSettings.logPrefix);
}