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How to write to a txt file in C#?

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Guest_imported

Guest_imported

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Jan 1, 1970
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Dear all,
I just start use C# to write my application yesterday..and I am a novice user. If I have the following text file that contains the following:

10000:flora
10001:mary
10002:john
10003:david
10004:tom

If I would like to modify "john" with "susan"..how can I acheive it through C#? Thanks!
 
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