function to convert String to upper case - vba

Question

I have been trying to make a user defined function I wrote return it's value in all upper case, using the String.ToUpper() method in VBA. When I try to use my UDF in excel, I get a compiler error that just highlights the top line of my UDF:
Function removeSpecial(sInput As String) As String
Here is the code in it's entirety:
Function removeSpecial(sInput As String) As String
Dim sSpecialChars As String
Dim i As Long
sSpecialChars = "\/:*?™""®<>|.&## (_+`©~);-+=^$!,'" 'This is your list of characters to be removed
For i = 1 To Len(sSpecialChars)
sInput = Replace$(sInput, Mid$(sSpecialChars, i, 1), "")
Next
sInput = sInput.ToUpper()
removeSpecial = sInput
End Function
The code works fine to remove special characters, but I would like it to also convert the inputted String to upper case.
I started receiving this error when I tried to add:
sInput = sInput.ToUpper()
If this code is commented out, my UDF works, but without returning the inputted string in all Upper.

Answer 1

Just the wrong function. You want
sInput = UCase(sInput)
Hope that helps

Answer 2

Confirm the function UCase(...) is working. Here is another example "Capitalize the first letter in the 2nd column from 2nd row till the end":
Sub UpCaseMacro()
' Declare variables
Dim OldValue As String
Dim NewValue As String
Dim FirstLetter As String
Dim i As Long
' Select values
lastRow = ActiveSheet.Range("B" & Rows.Count).End(xlUp).Row
ActiveSheet.Range(Cells(2, 2), Cells(lastRow, 2)).Select
' Update data
For i = 2 To Selection.Rows.Count
If Not IsEmpty(Cells(i, 2).Value) Then
OldValue = Cells(i, 2).Value
FirstLetter = Left(Cells(i, 2).Value, 1)
NewValue = UCase(FirstLetter) & Right(OldValue, Len(OldValue) - 1)
Cells(i, 2).Value = NewValue
End If
Next i
End Sub