Adding value of two cells to get result in 3rd cell

[Anshu]

I want to add the value of two cell to get output in 3rd cell with the help of VBA but the following code do not work.

Sub add()
Range("C2").Value = Range("A2").Value + Range("B2").Value
End Sub

I've already posted the question here https://excel.tips.net/T003217_Using...n_a_Macro.html
and come to know that the VBA is correct.

So the sample file is attached here.