I have the following code. Problem is that sometimes Cell C1 is Null. When the Cell is Empty, I want to Disable the command Button and change the Caption to nothing to Resume. How can I do this?

Code:
Private Sub UserForm_Initialize()
Dim strCap As String
strCap = Sheets("Output").Range("C1").Value & " Statement Resumed."
CmdRes.Caption = strCap
    
End Sub