C#中关闭SQL数据库连接的两种方法。

/// <summary>
/// 获取数据
/// </summary>
/// <param name="strSql"></param>
/// <returns>返回DataTable数据源</returns>
public static DataTable GetDataTable(string strSql)
{
MySqlConnection conn = null;
DataTable dt = new DataTable();

try
{
conn = OpenConn();
MySqlDataAdapter adapter = new MySqlDataAdapter(strSql, conn);
adapter.Fill(dt);
}
catch { return null; }
finally
{
CloseConn(conn);  //放在此处最合适
}

return dt;
}