How to fill a string with 0 on the left in C#

Hi Guys,
I have a string called FullFileName and it is returnig "F-4420079251". I need that returns
"F-04042007092501". How can I add 0 on the left when the day only has one character?

DateTime FileDate    = objFileInfo[i].LastWriteTime;
string FullFileName  = "F-" + FileDate.Month + FileDate.Day + FileDate.Year +
                                       FileDate.Hour + FileDate.Minute + FileDate.Second

Thanks,
Carolina
CarolinatAsked:
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Jens FiedererTest Developer/ValidatorCommented:
You can use ToString with a format option to specify the zero-fill
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Jens FiedererTest Developer/ValidatorCommented:
For example, FileDate.Day.ToString("00") will give you from "00" to "31"
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Jens FiedererTest Developer/ValidatorCommented:
You probably want to do that on the other components (month, hour, minutes,...) as well.
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_TAD_Commented:
string FullFileName  = "F-" + FileDate.Month.ToString("00") + FileDate.Day.ToString("00") + FileDate.Year. + FileDate.Hour + FileDate.Minute + FileDate.Second
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_TAD_Commented:

d'oh!  too slow....
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Mike TomlinsonMiddle School Assistant TeacherCommented:
You can do it with only ONE ToString() though:

DateTime FileDate    = objFileInfo[i].LastWriteTime;
string FullFileName  = "F-" + FileDate.ToString("MMddyyyyhhmmss");

See:
http://msdn2.microsoft.com/en-us/library/8kb3ddd4(vs.80).aspx
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Jens FiedererTest Developer/ValidatorCommented:
Good point, but you probably want to use HH rather than hh, to distinguish the AM from the PM.

The original attempt displayed hours from 0-23.
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