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I have to import the .txt file and segragate the nibbles(3 nibbles) and store the nibbles in an array for further processing.
i have written a code to import the .txt file to richtextbox and separate 3 nibbles and store it in array.

the below code which i have attached is working fine for small .txt file(< 100KB) but if file size is more for ex.: 2MB it is taking more time( 30 minutes ) to copy the nibbles to array.

kindly help me out to sort this problem.

the usual .txt file will be 2MB.

thanks in advance.

What I have tried:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        chk = 1

            Dim TextBox1 As String : TextBox1 = "D:\temp.txt"

            Dim dialog As New OpenFileDialog()

            If DialogResult.OK = dialog.ShowDialog Then
                TextBox1 = dialog.FileName
            End If

            Dim lines() As String = System.IO.File.ReadAllLines(TextBox1)

            For Each line As String In lines

            Dim dat(RichTextBox1.TextLength) As String

            For i As Integer = 0 To RichTextBox1.TextLength - 1

                dat(i) = (RichTextBox1.Text(i) & RichTextBox1.Text(i + 1) & 
                          RichTextBox1.Text(i + 2))
                i += 2


        Catch ex As Exception
            MessageBox.Show(ex.Message, Nothing, MessageBoxButtons.OK, 
        End Try

    End Sub
Updated 20-May-21 1:12am
Comments 20-May-21 8:34am    
Why reading line after line to the RTB?

Try .LoadFile

1 solution

Why are you using a RichTextBox just to process some data which you then throw away? The lines array has a Length property that tells you how many lines it has read. You can then build your dat list direct from the lines. No need for any text boxes.
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Member 12659926 20-May-21 7:21am    
thanks for reply...
the data which i have imported from txt file is not thrown away,it is required for further processing
the above code which i have done is working fine with less file sizes(<100KB),i want to know how i can optimize the above code so that it works for bigger files(>2MB).
or is their any other way that i can work on
Richard MacCutchan 20-May-21 7:31am    
Like I said, don't use a RichTextBox. The time and space required to rebuild it every time you add a line, will grow exponentially as more text is added. And it is not clear what you are doing with the dat list.
Member 12659926 20-May-21 7:38am    
I am reading from richtextbox and copying it to array.the below line does that...

dat(i) = (RichTextBox1.Text(i) & RichTextBox1.Text(i + 1) &
RichTextBox1.Text(i + 2))

for example.: if data in richtextbox is abc1234de45678
i want as dat(0) = abc dat(1) = 123... etc

the above code which i am copying to array is time consuming.

so can u suggest any alternatives approach or any example the does the job with dat list
i dont have much idea about dat list

Richard MacCutchan 20-May-21 7:56am    
I do not know how many times I need to say this: Do not use a RichtextBox to build all these strings.
Member 12659926 20-May-21 7:22am    
if u have any example code with dat list kindly share

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