How to detect arrow keys?

[marianme]

Hi!

Below is a portion of my program in Visual C#. What I want to do is if arrow keys are pressed nothing will happen. My problem, arrow keys are not detected.

private void comboBox4_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode != Keys.Right || e.KeyCode != Keys.Left || e.KeyCode != Keys.Up || e.KeyCode != Keys.Down)
            {
                string studname = "^" + comboBox4.Text.ToUpper();
                connection = new MySqlConnection(connectionstring);
                int i;
                int comboitems;
                //comboBox4.Items.Clear();
                for (i = 0; i < 100; i++)
                {
                    student[i] = "";
                }
                if (comboBox4.Items.Count != 0)
                {
                    for (; comboBox4.Items.Count != 0; )
                    {
                        comboBox4.Items.RemoveAt(0);
                    }
                }
                //for(i=0;)
                if (comboBox4.Text.Length > 2)
                {
                    //textBox1.Text = studname;
                    connection.Open();
                    string section = comboBox1.Text.ToUpper() + " " + comboBox2.Text + " " + comboBox3.Text.ToUpper();
                    string ret1 = "SELECT * FROM `stud_photo` WHERE section='" + section + "' and last_name REGEXP '" + studname + "' ";
                    MySqlCommand retcmd1 = new MySqlCommand(ret1, connection);
                    //MySqlDataReader reader1 = retcmd1.ExecuteReader();
                    //comboBox4.Items.Clear();
                    try
                    {
                        countstud = 0;
                        MySqlDataReader reader1 = retcmd1.ExecuteReader();
                        while (reader1.Read())
                        {
                            student[countstud] = Convert.ToString(reader1["last_name"]);
                            stud_name[countstud] = Convert.ToString(reader1["first_name"]);
                            countstud++;
                        }
 
 
 
                        for (i = 0; i < countstud; i++)
                        {
                            studs[i] = student[i] + ", " + stud_name[i];
                        }
 
                        for (i = 0; i < countstud; i++)
                        {
                            textBox1.Text += studs[i] + "\r\n";
                        }
 
 
                        for (i = 0; i < countstud; i++)
                        {
                            if (comboBox4.FindStringExact(studs[i]) == -1)
                            {
                                comboBox4.Items.Add(studs[i]);
                            }
 
                        }
                    }
                    catch (MySqlException xc)
                    {
                        //When handling errors, you can use your application's response based 
                        //on the error number.
                        //The two most common error numbers when connecting are as follows:
                        //0: Cannot connect to server.
                        //1045: Invalid user name and/or password.
                        //  switch (ex.Number)
                        //{
                        //  case 0:
                        MessageBox.Show(xc.Message);
                        //    break;
 
                        //case 1045:
                        //MessageBox.Show("Invalid username/password, please try again");
                        //  break;
                        //}
                    }
 
                }
            }
            /*else
            {
                MessageBox.Show("Arrow Keys Pressed.");
            }*/
        }
 

[PsychoCoder]

Do you have KeyPreview enabled for form (It's in the forms properties)