In your loop, you must concatenate all the lines of the string variable and output the result at the end. This is basically the case:
Dim Total As String
' ...
While EOF(1) = False
'read the next line of data in the text file
Line Input #1, strLine
Total = Total & vbNewLine & strLine
'increment the row counter
i = i + 1
Wend
MsgBox Total
. , - , , , , . . , 1000 , 999 .