how to visible the link button false in gridview

Question

   My Gridview as follows

Select                            Course       Startdate             Enddate

Clickhere(Link Button)    REO       10 May 2015     15 May 2015
Clickhere(Link Button)                 20 May 2015    25 May 2015
Clickhere(Link Button)                 28 May 2015   31 May 2015
 

 

how to visibe false the link button for 2nd row and third row in Gridview.

Because Whenever the Course value is empty in gridview. i do not want the link button.

for that how can i do in asp.net using c#.