輸入字符串格式不正確

Question

下面的代碼產生一個錯誤，說我的輸入字符串格式不正確。爲什麼？

private void button7_Click(object sender, EventArgs e) 
{ 
    string uriAddTagtoGroup = 
     string.Format("http://localhost:8000/Service/AddTagtoGroup/{group}/{tag}", 
        textBox6.Text, textBox7.Text); 
    //line above says input string was not in the correct format? 
} 

Answer 1

string.Format("http://localhost:8000/Service/AddTagtoGroup/{0}/{1}", 
       textBox6.Text, textBox7.Text); 

使用序