Getting the tittle of a webpage from URL.

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C#

WebForms

Trying to get the title of a website URL entered by the user in a textbox but I am not sure what to put in place of "source".

String title = Regex.Match(source, @"\<title\b[^>]*\>\s*(?<Title>[\s\S]*?)\</title\>", RegexOptions.IgnoreCase).Groups["Title"].Value;
                                label2.Text = title;

main portion of my code

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(this.textBox1.Text);

                    using (HttpWebResponse myHttpWebResponse = (HttpWebResponse)myRequest.GetResponse())
                    {
                        if (myHttpWebResponse.StatusCode == HttpStatusCode.OK)
                        {
                            string message = "200 OK";
                            string caption = "Status Code";
                            MessageBoxButtons buttons = MessageBoxButtons.OK;
                            DialogResult result;

                            // Displays the MessageBox.
                            result = MessageBox.Show(message, caption, buttons);

                            Stream streamResponse = myHttpWebResponse.GetResponseStream();

                            // Get stream object
                            StreamReader streamRead = new StreamReader(streamResponse);

                            Char[] readBuffer = new Char[256];
                            // Read from buffer
                            int count = streamRead.Read(readBuffer, 0, 256);
                            while (count > 0)
                            {
                                
                                // get string
                                String resultData = new String(readBuffer, 0, count);

                                // Write the data
                                richTextBox1.Text += (resultData);
                                
                                label3.ForeColor = System.Drawing.Color.Green;
                                label3.Text = " 200 OK ";
                                label3.Visible = true;

                                
                                //string title = Regex.Match(source, @"\<title\b[^>]*\>\s*(?<Title>[\s\S]*?)\</title\>", RegexOptions.IgnoreCase).Groups["Title"].Value;
                                //label2.Text = title;
                                label2.Visible = true;

                                // Read from buffer
                                count = streamRead.Read(readBuffer, 0, 256);

                            }// Release the response object resources.
                            streamRead.Close();
                            streamResponse.Close();
                            myHttpWebResponse.Close();
                        }
                    }
                }

                catch
                {
                    
                    if (textBox1.Text != (@" ^(\b(https):(\/\/|\\\\)[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?|\bwww\.[^\s])"))
                    {
                        string message2 = "Status Code";
                        string caption2 = "404 Not Found";
                        MessageBoxButtons buttons2 = MessageBoxButtons.OK;
                        DialogResult result2;
                        result2 = MessageBox.Show(message2, caption2, buttons2);
                        richTextBox1.Clear();
                        richTextBox1.Text = "Page not found!";
                        label3.Text = "Error 404 ";
                        label3.ForeColor = System.Drawing.Color.Red;
                        label3.Visible = true;
                    }
}
}

What I have tried:

String title = Regex.Match(textBox1.Text, @"\<title\b[^>]*\>\s*(?<Title>[\s\S]*?)\</title\>", RegexOptions.IgnoreCase).Groups["Title"].Value;
                                label2.Text = title;

did not work. what can I change?