How do I...Rename an Uploaded File

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C#

Hello Guys, please I need to rename this file after it has been copied to the folder specified. I need to be renamed to a value inside a textbox. I would really appreciate your help.

private void UploadPassportbutton_Click(object sender, EventArgs e)
        {
            // open file dialog
            OpenFileDialog getPassport = new OpenFileDialog();
            getPassport.Multiselect = false;
            getPassport.Title = "Select Passport Photograph";

            // image filters
            getPassport.Filter = "Image Files(*.png; *.PNG)|*.png; *.PNG";
            if (getPassport.ShowDialog() == DialogResult.OK)
            {
                //sets the new file path
                string newPath = Path.Combine(@"\\QUBE\Pics\", Path.GetFileName(getPassport.FileName));
                PassportpictureBox.Image = Image.FromFile(getPassport.FileName);

                //check if fileexists
                if (File.Exists(newPath))
                {
                    //You could rename the file
                    MessageBox.Show("That image already exists...", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                else
                {
                    File.Copy(getPassport.FileName, newPath);
                }
            }