Creating and appending text to txt file in VB.NET

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Try this:

Dim strFile As String = "yourfile.txt"
Dim fileExists As Boolean = File.Exists(strFile)
Using sw As New StreamWriter(File.Open(strFile, FileMode.OpenOrCreate))
    sw.WriteLine( _
        IIf(fileExists, _
            "Error Message in  Occured at-- " & DateTime.Now, _
            "Start Error Log for today"))
End Using

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