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Just for an example
Inside the Textbox.Text I have:

String = "01-23-45-67-89"


I want to convert it to Byte array with same value with &H
Byte = " &H01, &H23, &H45, &H67, &H89"


any suggestion please.

What I have tried:

Private Function HexStringToBytes(ByVal input As String) As Byte()
 
    Dim byteStrings() As String = input.Split(New Char() {","c})
    If (byteStrings.Length > 0) Then
        Dim retVal() As Byte = CType(Array.CreateInstance(GetType(Byte), byteStrings.Length), Byte())
        Dim idx As Integer = 0
        For Each byteString As String In byteStrings
            retVal(idx) = Convert.ToByte(byteString, 16)
            idx += 1
        Next
        Return retVal
    End If
    Return New Byte() {}
End Function
Posted
Updated 23-Mar-21 23:09pm
v2
Comments
jsc42 11-Mar-21 5:16am    
Are you trying to create a string with "&Hxx" texts in it, as per your description; or an array of bytes as per your sample code?
If it is the string, then you can do a simple text conversion e.g. Dim byteString As String = "&H" & inputString.Replace("-", ", &H")
If it is the array of bytes, then I'll let someone else reply as the technique is slightly harder and will need something in a 'Solution' section rather that a 'Comment' section.

There is a function in .NET which might help: SoapHexBinary.Parse(String) Method (System.Runtime.Remoting.Metadata.W3cXsd2001) | Microsoft Docs[^] - it requires spaces instead of hyphens, but string.Replace will deal with that.
VB
Dim s As String = "FF FF FF FF 82 00 01 02 03 04 00 05 01 02 03 04 05 ee ed"
Dim bytes As Byte() = SoapHexBinary.Parse(s).Value
 
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Same as yesterday[^], but with a different increment:
VB.NET
Shared Function HexStringToBytes(ByVal hexString As String) As Byte()
    Dim result As New List(Of Byte)()
    For i As Integer = 0 To hexString.Length - 1 Step 3
        result.Add(Convert.ToByte(hexString.Substring(i, 2), 16))
    Next
    Return result.ToArray()
End Function
Or, using a variation of your function:
VB.NET
Shared Function HexStringToBytes(ByVal input As String) As Byte()
    Dim byteStrings() As String = input.Split(New Char() {"-"c})
    Dim retVal() As Byte = Array.ConvertAll(byteStrings, Function(s) Convert.ToByte(s, 16))
    Return retVal
End Function


EDIT: Based on your comment, you are actually trying to convert an array of bytes to a string. Again, I gave you that function yesterday:
VB.NET
Shared Function BytesToHexString(ByVal bytes As Byte()) As String
    Dim sb As New StringBuilder()
    For i As Integer = 0 To bytes.Length - 1
        sb.Append(bytes(i).ToString("X2"))
    Next
    Return sb.ToString()
End Function
 
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v3
Comments
Nicky Ralph 11-Mar-21 6:47am    
I tried to use the code above and get the value of textbox1 to show it on Richtext1, I got and error " dimensional array of Byte cannot be converted to string"
Private Sub Button1_Click(
        'RichTextBox1.Text = HexStringToBytes(TextBox1.Text)
End Sub
Richard Deeming 11-Mar-21 6:51am    
Well, once again, you've described things the wrong way round.

Your question is about converting a string to an array of bytes.

That error tells me you are trying to convert an array of bytes to a string.

Stop randomly typing code, and start thinking about what you are trying to do!
Richard Deeming 11-Mar-21 7:04am    
The textbox text is a STRING. It is NOT a byte array!

You want to convert a byte array to a string. As I showed you yesterday.
Nicky Ralph 11-Mar-21 7:08am    
YES, I want to convert string into byte array with same value of hex. something like this, Inside the textbox1.text is a HEX VALUE

TEXTBOX1.TEXT = "A1-B2-C3-D4-E5"


I want to convert it into byte like

byte() ={&HA1, &HB2, &HC3, &HD4, &hE5}
Richard Deeming 11-Mar-21 7:09am    
No, you don't.

You want to convert the string to a byte array - which I've already shown you how to do - and then convert the byte array back to a string - which I've also shown you how to do.

You cannot store a byte array in a string property!

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