下面的代码会产生一个错误,指出我的输入字符串格式不正确。为什么?
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?
}