Thank you for your suggestion,But I have applied the same code already,But while retrieving the values the DateTimevalue ,Double value ,Float value properties of that cell is not coming it is appearing as Exception of Type :'{System.Exception}' occured is there.
If I change the format of the cell manually those same properties is having the value as 0.0 for 00:00 in DateTimevalue ,Double value ,Float value and value property will be having the Date value as #12/31/1899# {Date}
Why the same is not happening when we change the style dynamically in code?
Please suggest me.