private void button3_Click(object sender, EventArgs e)
{
string s = search__st_textBox.Text;
Search_student_Form search_Student_ = new Search_student_Form(s);
search_Student_.Show();
}
private void search_st_button_Click(object sender, EventArgs e)
{
string s = textBox1.Text;
Search_student_Form students_Info_Form = new Search_student_Form(s);
students_Info_Form.Show();
}