Datagridview滚动条在每个间隔使用计时器更新内容时返回

I am reading data from textfile to datagridview(which is created on runtime) with comma separated. My text file data is actually a event log of my process contains timestamp and status which is dynamically updating every 3 or 4 seconds. i need to show the data dynamically updating in datagridview. When ever the data updated using timer interval, the scroll bar going back to top position and i cant hold it to scroll down. Can any one help me to overcome this issue?I am reading data from textfile to datagridview