How to format the file size

[ChinChin]

Hi,

I have made a window application that get file information from the server the file size return in bytes. I need help on how to format the file size accordingly so that it will return the file size in either "Bytes", "K's" or "Meg's".

Below's the script that I have for format the file size. But it doesn't work.
Can you please help me? Thanks a lot.


private void lstFiles_SelectedIndexChanged_1(object sender, EventArgs e)
{

try
{
lblDir.Text = treeView1.SelectedNode.FullPath;
string path = Path.Combine(treeView1.SelectedNode.FullPath, lstFiles.SelectedItem.ToString());
FileInfo fi = new FileInfo(path);

lblFile.Text = lstFiles.SelectedItem.ToString();
lblSize.Text = fi.Length.ToString();
if (fi.Length >= 1024 * 1024 * 1024)
{
string.Format("{0:########0.00} GB", ((double)fi.Length) / (1024 * 1024 * 1024));
}
else if (fi.Length >= 1024 * 1024) string.Format("{0:####0.00} MB", ((double)fi.Length) / (1024 * 1024));
else if (fi.Length >= 1024) string.Format("{0:####0.00} KB", ((double)fi.Length) / 1024);
else string.Format("{0} bytes", fi.Length);
lblCreated.Text = fi.CreationTime.ToString();
}
catch { }
}

[Motoma]

What in the code doesn't work? Does fail completely? Does it generate any error messages? Does it give the wrong numbers? Does it get drunk and prank call it's ex-girlfriends?
Please elaborate, we need to know what we are looking for.

[ChinChin]

Basically when we get the file information from the server, we will get the file size in bytes. My intention is how to make it returns in bytes, KB or MB accordingly to the the file size. To make this work, i added the code as below in the script to format the file size. But, all the file size still return in bytes and no change to KB, MB or GB. The script gives no error and i still can run the script. It just that the script that i added in as below seem no function. I have no idea whether the coding writen as below to format the file size correctly or not and why it cannot work. I am new in this area, please be patient to me...
Thanks in advance.

if (fi.Length >= 1024 * 1024 * 1024)
{
string.Format("{0:########0.00} GB", ((double)fi.Length) / (1024 * 1024 * 1024));
}
else if (fi.Length >= 1024 * 1024) string.Format("{0:####0.00} MB", ((double)fi.Length) / (1024 * 1024));
else if (fi.Length >= 1024) string.Format("{0:####0.00} KB", ((double)fi.Length) / 1024);
else string.Format("{0} bytes", fi.Length);

[Motoma]

You are doing string formatting, however, you are never assigning the formatted string to your label. You are doing label assignment before your string formatting.

[ChinChin]

I got it!!!!!! Very very thanks for your hint!!!
By the way, I have one more question...
How to Sort files in a directory by size? For now, the files show in the list box of my window application are sorted by Name, not size.
Can you please guide me on this?
Thanks a lot.

[Motoma]

You will have to write a sort routine using one of the standard algorithms.