How to change filepath when check a radiobutton? Visual basic - vb.net

Question

My problem here is that i have 3 radiobuttons for 3 different categories:
Huse Folii and Altele.
The idea is when i select a radiobutton,the filepath will change to Huse,Folii or Altele.
For example i tried to make _path :
Dim _path As String = IO.Path.Combine("C:\Descriere\Huse\")
then use the _path here:
Dim ioFile As New System.IO.StreamReader(_path + "a.txt")
but it didn't worked,for sure i do something wrong,but i can't find how or where to use that _path...
Here is the code:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
On Error Resume Next
TextBox1.Clear()
If RadioButton1.Checked = True Then
Dim _path As String = IO.Path.Combine("C:\Descriere\Huse\")
End If
If RadioButton2.Checked = True Then
Dim _path As String = IO.Path.Combine("C:\Descriere\Folii\")
End If
If RadioButton3.Checked = True Then
IO.Path.
Dim _path As String = IO.Path.Combine("C:\Descriere\Altele\")
End If
Dim ioFile As New System.IO.StreamReader(_path + "a.txt")
Dim lines As New List(Of String)
Dim rnd As New Random()
Dim line As Integer
While ioFile.Peek <> -1
lines.Add(ioFile.ReadLine())
End While
line = rnd.Next(lines.Count + 1)
TextBox1.AppendText(lines(line).Trim())
ioFile.Close()
ioFile.Dispose()
Dim ioFile2 As New System.IO.StreamReader(path:=+"core.txt")
Dim lines2 As New List(Of String)
Dim rnd2 As New Random()
Dim line2 As Integer
While ioFile2.Peek <> -1
lines2.Add(ioFile2.ReadLine())
End While
line2 = rnd2.Next(lines2.Count + 1)
TextBox1.AppendText(lines2(line2).Trim())
ioFile2.Close()
ioFile2.Dispose()
Dim ioFile3 As New System.IO.StreamReader(path:=+"x.txt")
Dim lines3 As New List(Of String)
Dim rnd3 As New Random()
Dim line3 As Integer
While ioFile3.Peek <> -1
lines3.Add(ioFile3.ReadLine())
End While
line3 = rnd3.Next(lines3.Count + 1)
TextBox1.AppendText(lines3(line3).Trim())
ioFile3.Close()
ioFile3.Dispose()
TextBox1.Text = Replace(TextBox1.Text, "BRAND", TextBox2.Text)
TextBox1.Text = Replace(TextBox1.Text, "MODEL", TextBox3.Text)
Dim count As Integer = 0
count = TextBox1.Text.Split(" ").Length - 1
Label5.Text = "Caractere:" & Len(TextBox1.Text)
End Sub

Answer 1

You are using IO.Path.Combine but you have nothing to Combine at the place of use in your code. You have to use IO.Path.Combine later in your code because this is a method to Combine part of a path and a filename e.g. set your _path first and combine in a second step. Please note this code is not tested for your needs, because your coding is not clear to me.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim directoryName As String = "D:\"
On Error Resume Next
TextBox1.Clear()
If RadioButton1.Checked = True Then
directoryName = "D:\Descriere\Huse"
End If
If RadioButton2.Checked = True Then
directoryName = "D:\Descriere\Folii"
End If
If RadioButton3.Checked = True Then
'//--- IO.Path.
directoryName = "D:\Descriere\Altele"
End If
Dim ioFile As New System.IO.StreamReader(System.IO.Path.Combine(directoryName, "a.txt"))
...
Dim ioFile2 As New System.IO.StreamReader(System.IO.Path.Combine(directoryName, "core.txt"))
...
Dim ioFile3 As New System.IO.StreamReader(System.IO.Path.Combine(directoryName, "x.txt"))
...
End Sub
Please use the debugger of your IDE because your code isn't clean e.g. a hanging aroung IO.Path.