Invalid attempt to call Read when reader is closed.

private void toolStripButton3_Click_1(object sender, EventArgs e)
        {

            int damage = Convert.ToInt16(numericUpDown1.Value);
            UGIcon.Open();
            cmd = new SqlCommand("select * from purchase", UGIcon);
            SqlDataReader s = cmd.ExecuteReader();
            while (s.Read())
            {
                if (toolStripTextBox1.Text != s["cm"].ToString())
                {
                    s.Close();
                    MessageBox.Show("Please check the name");
                }
               
                
            }
            UGIcon.Close();   
            if (textBox2.Text == "")
                {
                    errorProvider1.SetError(textBox2, "Provide Owner name");
                }
                else if (textBox3.Text == "")
                {
                    errorProvider1.SetError(textBox3, "Provide Address");
                }
                else if (numericUpDown2.Value >= damage)
                {
                    MessageBox.Show("check Damage quantity");
                }
                else if ((maskedTextBox1.Text.Trim().Length <= 10))
                {
                    MessageBox.Show("Provide full phone number");
                }
                else
                {
                    UGIcon.Open();
                    cmd = new SqlCommand("update purchase set om='" + textBox2.Text + "', address='" + textBox3.Text + "', phone='" + maskedTextBox1.Text.ToString() + "',baled='" + numericUpDown2.Value + "',paid='" + textBox9.Text + "' where cm='" + toolStripTextBox1.Text + "'", UGIcon);
                    SqlDataReader dr;
                    dr = cmd.ExecuteReader();
                    dr.Close();
                    MessageBox.Show("Details has been updated sucessfully", "Update Window", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    UGIcon.Close();
                }
            }

        }