C# Hata Mesajı yerine Web sayfası getirme

using System; 
  using System.Collections.Generic; 
  using System.ComponentModel; 
  using System.Data; 
  using System.Drawing; 
  using System.Linq; 
  using System.Text; 
  using System.Windows.Forms; 
   
  namespace deneme1233 
  { 
      public partial class Form1 : Form 
      { 
          public Form1() 
          { 
              InitializeComponent(); 
          } 
   
          private void button1_Click(object sender, EventArgs e) 
          { 
              try 
              { 
                  int sayi = Convert.ToInt32(textBox1.Text); 
              } 
              catch 
              { 
                  System.Diagnostics.Process.Start("www.google.com"); 
              } 
          } 
      } 
  }