how to search asp.net textbox value in google ?

protected void btnsearch_Click(object sender, EventArgs e)
{
try
{
string name = string.Empty;
StringBuilder queryaddress = new StringBuilder();
queryaddress.Append("http://google.com/search?q=");
if (txtsearch.Text != string.Empty)
{
name = txtsearch.Text.Replace(' ', '+');
queryaddress.Append(name + ' ' + '+');
}
string url = queryaddress.ToString();
Response.Redirect(url, false);
}

catch (Exception ex)
{
Response.Redirect(ex.ToString());
}
}

Thanks & Regards
Hari