This is the aspx code

I am comparing e.NewValues["Schedule"] != e.OldValues["Schedule"] in my testing, they are the same value but the if return true in code below, why is that?

I am comparing e.NewValues[“Schedule”] != e.OldValues[“Schedule”], in my testing, they are the same value but the if return true in code below, why is that?

I need check whether CheckBox in GridView is checked or not in c# and ASP.Net and to check that all the checkboxes in my gridview are selected, some are selected and some are not, according to a predefined condition, the previous column in the gridview must equal OK.