How to set default value to TimeSelector inside GridView when value is null using C# and VB.Net in ASP.Net

Please visit this site

http://www.aspsnippets.com/Articles/TimePicker-control-in-ASPNet-with-example.aspx

When I display a NULL value data from the database column "COME_OUT" to Gridview in the "Out" result is the current time based on the time of my computer. But, I want to view empty data. Please explanations

Like this

http://www.tiikoni.com/tis/view/?id=7f69096