Printing out zeros after decimals into excel

Question

I am trying to print out a double to excel. In my GUI the number prints out correctly.

But when I write the number to an excel file the number comes out with out the zeros after the decimal place. For examples the number 1.10 prints out correctly in my GUI, but in excel in prints out 1.1.

double foo = 1.10;
writeline(foo.ToString("F2"));

I have tried String.Format("{0:0.00}", foo.ToString("F2")); without resolving this issue. I am pretty sure the problem is when the number gets into excel, excel truncates all zeros after the decimal place. Is there a way to send excel a message to print out two places after the decimal?

I am working on someone elses code that opens and closes the excel file. They are using File.Create and StreamWriter to create and open the excel file

Answer 1

String.Format("{0:0.00}", foo.ToString("F2"));

won't work, because you're trying to format something, that is converted to string already. Use a direct variable - your foo should return a numeric value and then you'd be able to use it like this (example):

String.Format("{0:0.00}", foo.GetDouble("F2"));

In other words:

String.Format("{0:0.00}", "1.10");    //wrong
String.Format("{0:0.00}", 1.10d);     //correct

Answer 2

I've seen too many complex answers for a simple problem, I had the same problem too that's why I came here but I didn't get any reasonable answers. I figured it out though, just highlight the column, right click on it ---- format cells-----a dialogue box will come up, go under category---Number, then add as many decimal places as you want.