private void btnDatabase_Click(object sender, EventArgs e)
{
    using (SqlConnection connection =
	new SqlConnection("Data Source=(local);" +
			  "Database='Exercise1';" +
			  "Integrated Security=yes;"))
    {
	SqlCommand command =
		new SqlCommand("ALTER TABLE Customers " +
			       "DROP Column DateIssued;",
				connection);
	connection.Open();
	command.ExecuteNonQuery();

	MessageBox.Show(
		"The column named \"DateIssued\" has been deleted.");
    }
}