Reading Global Sheet's DataTable Value

[Bhuvana]

Dear Experts
Need help in order to - convert a datatable value (cell value) to a string

I m adding a column dynamically (in global sheet), and entering a value in it, for e.g., column Name - BHUVANA, and the value entered in the datatable cell; (i.e. BHUVANA columns 1st row) say BHUVANA1 is - XYZ

Now the problem is when I try to access the value (XYZ) in BHUVANA1, then it is considering it as numeric/integer value, and hence unable to access/get the value
Pls. help

Thanks