Question

I wrote this:

protected void btnup_Click(object sender, EventArgs e)
{
    if (ASPxUploadControl1.HasFile)
    {
        try
        {
            string filename = Path.GetFileName(ASPxUploadControl1.FileName);
            ASPxUploadControl1.SaveAs(Server.MapPath("upload/") + filename);
            StatusLabel.Text = "Upload status: File uploaded!";
        }
        catch (Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
}

Problem is, if I already have File1.jpg, it will overwrite it if someone else uploads File1.jpg.

What to do here?

Answer 1

Here what you can do to make the file name unique on server to avoid overwrites.

if (ASPxUploadControl1.HasFile)
{
    try
    {
        string extension = Path.GetExtension(ASPxUploadControl1.FileName);
        string id = Guid.NewGuid().ToString();
        string fileLocation = string.Format("{0}/{1}{2}", 
                                            Server.MapPath("upload/"), 
                                            id, extension);
        ASPxUploadControl1.SaveAs( fileLocation );
        StatusLabel.Text = "Upload status: File uploaded!";
    }
    catch (Exception ex)
    {
        StatusLabel.Text = "Upload status: The file could not be uploaded. " 
                            + "The following error occured: " + ex.Message;
    }
}