File Existence Check

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Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

bool success;

//  Any string unlocks the component for the 1st 30-days.
success = ftp.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(ftp.LastErrorText);
    return;
}

ftp.Hostname = "ftp.***.com";
ftp.Username = "***";
ftp.Password = "***";

//  Connect and login to the FTP server.
success = ftp.Connect();
if (success != true) {
    MessageBox.Show(ftp.LastErrorText);
    return;
}

//  Set the current remote directory to where the file is located:
success = ftp.ChangeRemoteDir("/something");
if (success != true) {
    MessageBox.Show(ftp.LastErrorText);
    return;
}

//  Test to see if the file exists by getting the file size by name.
//  If a -1 is returned, the file does not exist.
int fileSize;
fileSize = ftp.GetSizeByName("test123.txt");
if (fileSize < 0) {
    textBox1.Text += "file does not exist" + "\r\n";
}
else {
    textBox1.Text += "file exists and is " + Convert.ToString(fileSize)
         + " bytes in size" + "\r\n";
}

ftp.Disconnect();