problem with enums

 Hi,
I am using enums in my project to save the mode of the grid. Code snippet is as follows:
 
public enum SheetModes
    {
        View = 1,
        Add  ,
        Edit

    }

SheetModes Mode;
 There are 3 buttons on the page namely, Create, Load, Edit and Save

In Create Button  click,    Mode= SheetModes.Add;
In Load Button Click,  Mode= SheetModes.View;
In edit button click, I am setting the Mode to SheetModes.Edit; 
in Save button click, I need to check the mode and execute insert or update functions. But when ever I set the value and load the page, the value to the Mode is lost, its set to 0 and am unable to check the Mode in the Save Button Click.
I am not sure whe ...