Allow alpha numeric values instead of isnumeric - excel

Question

I have the below code for entering a function and copying the orientation and borders of the above line.
But in this it only accept numeric values, how can i modify the code so that i can enter alpa numeric values in that cell.
Below is the code
Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Range("B:B")) Is Nothing Then
If IsNumeric(Target.Value) Then ' Check if cell contains a numeric value
If Target.Value <> "" Then
Range("A" & Target.Row).Formula = "=IF(B" & Target.Row & "<>"""",ROW()-ROW($A$15)+1,"""")"
' Copy border, border color and orientation from row above
With Range("A" & Target.Row & ":H" & Target.Row)
.Borders.LineStyle = .Offset(-1, 0).Borders.LineStyle
.Borders.Color = .Offset(-1, 0).Borders.Color
.Orientation = .Offset(-1, 0).Orientation
End With
Else
' Check if entire row in column B is empty
If WorksheetFunction.CountA(Range("B" & Target.Row & ":H" & Target.Row)) = 0 Then
' Delete entire row
Rows(Target.Row).Delete
Else
' Clear contents of column A to H for the row where value was deleted in column B
Range("A" & Target.Row & ":H" & Target.Row).ClearContents
End If
End If
End If
End If
End Sub

Answer 1

Here's a small Function you could add to your code, to give it IsAlphaNumeric functionality.
Function IsAlphaNumeric(t) as Boolean
Dim i as Long
IsAlphaNumeric = True
For i = 1 To Len(t)
If Not (Mid(t, i, 1) Like "[A-z0-9]") Then
IsAlphaNumeric = False
Exit For
End If
Next
End Function
You can use it like this:
If IsAlphaNumeric(Target.Value) Then ' Check if cell contains alpha-numeric value