how to check for an empty .csv extension file in C#

Question

I have an input type file in my .aspx page.

<input type="file" id="BatchImportFile" runat="server">

When I am trying to check the File.PostedFile.ContentLength property for an empty file it is always showing value as 2 even if I upload an empty file. I want to check an empty .csv file .

Answer 1

The file that you uploaded simply was not empty. 2 bytes is the length of a Windows line terminator. Maybe it contains an empty line. Unicode BOM headers are also 2 bytes in length.

Use String.IsNullOrWhiteSpace to check for this case.