while reading number greater than 12 digits from excel using c#,number get converted to zero

Question

i\'m trying to read a number with length greater than 12 digits from excel file using c# using below query

 \"select Format([F1], \'Number\') as Code\";
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Answer 1

According to MSDN:

Excel follows the IEEE 754 specification on how to store and calculate floating-point numbers. Excel therefore stores only 15 significant digits in a number, and changes digits after the fifteenth place to zeroes.

To work around this behavior, format the cell as text. The cell can then display up to 1,024 characters.

http://support.microsoft.com/kb/269370