Question

I’m struggling on some coding and was hoping someone could help me out please, what I’m trying to do is read a text file and convert column2 in to lowercase and save it again.

But I get Value of type ‘Integer’ cannot be converted to ‘System.Globalization.CultureInfo’. after .ToLower?

  Dim Convertcolumn = From line In System.IO.File.ReadLines("Path")
              Select line.Split(" "c)(1) & line.ToLower(1)
    Dim writer As IO.StreamWriter = New IO.StreamWriter("Path2")

    For Each line In Convertcolumn
        writer.Write((line) & Environment.NewLine)
    Next

Updated coding:

Dim Convertcolumn = From line In System.IO.File.ReadLines("C:\Test1.txt")
                    Select line.Split(" "c)(1) & line.Split(" "c)(1).ToLower()

Dim writer As IO.StreamWriter = New IO.StreamWriter("C:\Test2.txt")

For Each line In Convertcolumn
    writer.Write((line) & Environment.NewLine)
Next

Sorry when i added the comments its not showing as columns the data looks like this

D00001 BLACK user
D00002 BLACK user

and i want to change it to

D00001 black user
D00002 black user

Answer 1

Your original code can’t work when the file contains columns. You’ll need:

    Using parser = New FileIO.TextFieldParser("Path")
        parser.TextFieldType = FileIO.FieldType.Delimited
        parser.Delimiters = New String() {" "}
        Using writer = New IO.StreamWriter("Path2")
            While True
                Dim words = parser.ReadFields()
                If words Is Nothing Then Exit While
                If words.Length > 1 Then words(1) = words(1).ToUpper
                writer.WriteLine(String.Join(" ", words))
            End While
        End Using
    End Using