How to copy file form one PC to other PC

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C#

i have a program to copy file form one Pc to other Pc ,i tried with File.Copy and In Textbox3 i am providing IpAddress with Path ex:@"10.29.80.123\\newFolder" program is not giving Exceptions and errors but giving Expected output.


Please help to resolve.

What I have tried:

private void btn_ChooseFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.ShowDialog();
            textBox1.Text = openFile.FileName;
            filename = textBox1.Text;
        }
 private void btn_Copy_Click(object sender, EventArgs e)
        {
            copy();
}
 public void copy()
        {
            string sourceFileName;
            string backup;
            try
            {
                
                sourceFileName = Path.GetFileName(filename);
                File.Copy(Path.Combine(filename, sourceFileName), Path.Combine(textBox3.Text, sourceFileName),true);
            }
            catch
            {
                MessageBox.Show("File Not Found");
            }
        }