How to check file size on upload

Question

Whats the best way to check the size of a file during upload using asp.net and C#? I can upload large files by altering my web.config without any problems. My issues arises

Answer 1

You can do the checking in asp.net by doing these steps:

protected void UploadButton_Click(object sender, EventArgs e)
{
    // Specify the path on the server to
    // save the uploaded file to.
    string savePath = @"c:\temp\uploads\";

    // Before attempting to save the file, verify
    // that the FileUpload control contains a file.
    if (FileUpload1.HasFile)
    {                
        // Get the size in bytes of the file to upload.
        int fileSize = FileUpload1.PostedFile.ContentLength;

        // Allow only files less than 2,100,000 bytes (approximately 2 MB) to be uploaded.
        if (fileSize < 2100000)
        {

            // Append the name of the uploaded file to the path.
            savePath += Server.HtmlEncode(FileUpload1.FileName);

            // Call the SaveAs method to save the 
            // uploaded file to the specified path.
            // This example does not perform all
            // the necessary error checking.               
            // If a file with the same name
            // already exists in the specified path,  
            // the uploaded file overwrites it.
            FileUpload1.SaveAs(savePath);

            // Notify the user that the file was uploaded successfully.
            UploadStatusLabel.Text = "Your file was uploaded successfully.";
        }
        else
        {
            // Notify the user why their file was not uploaded.
            UploadStatusLabel.Text = "Your file was not uploaded because " + 
                                     "it exceeds the 2 MB size limit.";
        }
    }   
    else
    {
        // Notify the user that a file was not uploaded.
        UploadStatusLabel.Text = "You did not specify a file to upload.";
    }
}