C# 웹 검색

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//웹페이지 여는 함수   private void OpenWebPage(string uri)         {             System.Diagnostics.Process process = new System.Diagnostics.Process();             process.StartInfo.FileName = uri;             process.Start();         }               private void Searchgo_Click(object sender, EventArgs e)         {             StringBuilder str = new StringBuilder();             // Append로 지정된 문자열의 복사본을 이 인스턴스의 끝에 추가             str.Append(textBox1.Text);                         if (comboBox1.SelectedIndex == 0)             {                 // textBox에 글자가 입력이 안되었을때..                 if (textBox1.Text == "")                     OpenWebPage("http://www.daum.net/");                                   else                     OpenWebPage("http://search.daum.net/search?nil_suggest=btn&nil_ch=&rtupcoll=&w=tot&m=&lpp=&q=" + str.ToString());             }                 if (comboBox1.SelectedIndex == 1)             {                 // textBox에 글자가 입력이 안되었을때                 if (textBox1.Text == "")                     OpenWebPage("http://www.naver.com/");                               else                      OpenWebPage("http://search.naver.com/search.naver?sm=tab_hty&where=nexearch&query=" + str.ToString() + "&lr=&aq=f");                                }             if (comboBox1.SelectedIndex == 2)             {                 // textBox에 글자가 입력이 안되었을때                 if (textBox1.Text == "")                                        OpenWebPage("http://www.google.co.kr/");                                   else                     OpenWebPage("http://www.google.co.kr/search?complete=1&hl=ko&q=" + str.ToString());                                }         }