Update not working properly(there is already an open DataReader associated with this Command which must be closed first)

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())
        {
            MessageBox.Show("Please check the name");
        }
        else
        {
            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
            {

                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();//There is already an open DataReader associated with this Command which must be closed first. 
                dr.Close();
                MessageBox.Show("Details has been updated sucessfully", "Update Window", MessageBoxButtons.OK, MessageBoxIcon.Information);


            }
        }

    }

    s.Close();
    UGIcon.Close();
}