En vb c'est facile mais je suis pas sur qu'en .NET ce soit la même chose t'essaieras...
Dim fNum1, fNum2 As Byte
Dim bDatas() As Byte
fNum1 = FreeFile
Open "D:\dest.txt" For Binary As #fNum1
fNum2 = FreeFile
Open "D:\file1.ext" For Binary As #fNum2
ReDim bDatas(1 To LOF(fNum2))
Get #fNum2, , bDatas()
Put #fNum1, , bDatas()
Erase bDatas
Close fNum2
fNum2 = FreeFile
Open "D:\file2.ext" For Binary As #fNum2
ReDim bDatas(1 To LOF(fNum2))
Get #fNum2, , bDatas()
Put #fNum1, , bDatas()
Erase bDatas
Close fNum2
Close fNum1
bonne prog'
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