Pevent default formatting on numbers when exporting GridView to Excel file

I my exporting data through dataset to excel. But one column say awb no havaing datatype nvarchar contains long int no say : 123456789012345

Then instead of displaying this no in numeric format(123456789012345) it is displaying in exponent form(1.23457E+19).Is there any way to stop this i want data in numeric format (like this 123456789012345).