Find word in text file and write a line

[sputnik]

How can I open a text file, find a certain word in the text file, and then, just before that word, write a line of text to the file - then save the file?

 

[BlackByte]

Look up the following :

System.IO.StreamReader()
String.Contains()
String.Insert()

oh and also

System.IO.StreamWriter()
and
My.Computer.FileSystem.WriteAllText() 'dont know if i got the method name correct

 

[sputnik]

the problem I'm having now - - I get the position of the string I'm looking for no problem
However, when I do String.Insert(position, NewText), it never actually adds the text - - I tried this with 2 textboxes:
Dim ENew As String = TextBox1.Text
Dim pos As Long
pos = ENew.IndexOf("TheTextIAmLookingFor") - 1 ' I get a good number here for the position

ENew.Insert(pos, "AAAAA")
TextBox2.Text = ENew
TextBox2.SelectionStart = TextBox2.Text.IndexOf("AAAAA") '<<< right here, it never finds that position - it gives me a -1 and I can't see 'AAAAA ' in the textbox
TextBox2.SelectionLength = 5

 

[BlackByte]

Instead of :

ENew.Insert(pos, "AAAAA")
TextBox2.Text = ENew

Try 'warning untested code

TextBox2.Text=ENew.Insert(pos,"AAAAA")

 

[BlackByte]

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