public void Search()
{
string text = "";
int index;
text = richTextBox1.Text.Substring(selected_index + keyword.Length);
index = text.IndexOf(keyword);
if (index != -1)
{
richTextBox1.Focus();
richTextBox1.Select(selected_index + keyword.Length + index, keyword.Length);
selected_index += index + keyword.Length;
}
else
{
if (selected_index == -keyword.Length)
{
MessageBox.Show("No such keyword \"" + keyword + "\"in this file", "Error");
keyword = "";
Lab1_8_Form_2 f2 = new Lab1_8_Form_2();
f2.f1 = this;
f2.Show();
}
else
{
selected_index = -keyword.Length;
Search();
}
}
}
private void Button3_Click(object sender, EventArgs e)
{
if (keyword == "")
{
Lab1_8_Form_2 f2 = new Lab1_8_Form_2();
f2.f1 = this;
f2.Show();
}
else
{
Search();
}
}