DataGridViewCheckBoxColumn values

Question

Hi there,

I'm using DataGridViewCheckBoxColumn, when a check box is unchecked sometimes I get the value {} (it's not a string value) instead of false. I want to get the value false or true.

Does anybody know why do I get the value {} and how can identify this value programatically?

Thanks in advance,

Elvia

PS: Windows application in Microsoft Visual C# 2005