test string from textbox for alpha or numeric characters

vba 2010

userform textbox37

what i need:

I have a variable assigned to a userform textbox
cD =  Userform2.Textbox37.text

The textbox is being filled from an  activecell.value  on the sheet

I need to check  cD to test whether or not it contains alpha or numeric characters..

I'm picking up what appears to be  " "  FROM THE Sheet cell, but cant capture what it is...so trying to determine what it is NOT ?

I have tried   ISEMPTY

IF cD  = " "

none of these work ?

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Kyle AbrahamsSenior .Net DeveloperCommented:

instead of .Text
Martin LissOlder than dirtCommented:
Can you attach your workbook and describe the process you want to check?
FordraidersAuthor Commented:
If IsEmpty(UserForm2.TextBox37.value) = True Then
MsgBox "No Item To Srearch On", vbCritical, "Null Search"
End If

no good
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Kyle AbrahamsSenior .Net DeveloperCommented:
If Format(UserForm2.TextBox37.value) = vbNullString Then
MsgBox "No Item To Srearch On", vbCritical, "Null Search"
End If
Professor JMicrosoft Excel ExpertCommented:
here you go

create a userform and then add a text box and then click on view code of the userform and then paste this.   it will work. I tested it

Private Sub UserForm_Initialize()
    Dim ctl As Control
  Dim LC As Integer ' Loop counter
  Dim testText As String

    For Each ctl In Me.Controls
        If TypeName(ctl) = "TextBox" Then
   If Len(Me.TextBox1.Text) = 0 Then
     MsgBox "Box is empty"
     Exit Sub
   End If
   testText = Me.TextBox1.Text
   For LC = 1 To Len(testText)
     If Not IsNumeric(Mid(testText, LC, 1)) Then
       MsgBox "Entry is not entirely numeric."
       Exit Sub
     End If
   MsgBox "Entry is numeric."
        End If
    Next ctl
End Sub

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Martin LissOlder than dirtCommented:
If Trim(UserForm2.TextBox37.value) = "" Then
MsgBox "No Item To Srearch On", vbCritical, "Null Search"
End If

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Kyle AbrahamsSenior .Net DeveloperCommented:
Trim is the way to go:

From here:  http://microsoft.wikia.com/wiki/Microsoft_Office/VBA/General

this is a generic one
Function IsNullOrEmpty(val As Variant) As Boolean
   'First conditional validates for Nothing
   'Second condition validates for an Empty String situation "" or "     "
   Dim ret As Boolean: ret = False
   If IsMissing(val) Then
      ret = True
   ElseIf (val Is Nothing) Then
      ret = True
   ElseIf (val & vbNullString = vbNullString) Then
      ret = True
   ElseIf (Len(Trim(val)) <= 0) Then
      ret = True
   End If
   IsNullOrEmpty = ret
End Function

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if IsNullOrEmpty(UserForm2.TextBox37.value) then
MsgBox "No Item To Srearch On", vbCritical, "Null Search"
End If
FordraidersAuthor Commented:
i finally found a solution also...works fine..
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