How do I search a text file in VB.NET to bring up a specific string

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Hello,
I need to search a text file with an eight digit integer, to find a whole line which the eight digit integer is contained in.
I tried using streamreader though couldn't get the results I wanted.
Any help would be greatly appreciated.

What I have tried:

option explicit on
imports system.io
Dim search As StreamReader
Dim filename, textline As String, quantity, price, gtin8 As Integer
filename = ("newname.txt")
gtin8 = TextBox1.Text
search = New StreamReader(filename)
If search.contains(gtin8) Then
ListBox1.Items.Add(textstring)

Posted 17-Jun-16 23:23pm

Member 12590854

Updated 17-Jun-16 23:44pm

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phil.o 18-Jun-16 5:25am

Please use the green "Improve question" button and show the actual code you have tried.

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OriginalGriff · Answer 1 · 2016-06-17T23:30:00

In order to search the file for a string, you need to read the file, either completely, or in chunks. Chunks is harder, because you have to be aware that your match string could be "on the border" and spread across two chunks.
But the simplest way is just to read the whole file:

VB.NET

Private Function FileContainsString(path As String, match As String) As Boolean
	Dim s As String = File.ReadAllText(path)
	Return s.Contains(match)
End Function