Auto Select Text in Textbox

I am new to ASP.Net, building a web page using VB.Net as the code behind file.   I need be able to have a text box select all text in box when it gets focus.  Trying to modify the code for Set Focus for this purpose without success.  Any suggestions.  Thanks.  Shawn
 
Set Focus (Works Great)
 

Private Sub SetFocus(ByVal FocusControl As Control)
Dim Script As New System.Text.StringBuilder
Dim ClientID As String = FocusControl.ClientID
With Script
.Append("<script language='javascript'>")
.Append("document.getElementById('")
.Append(ClientID)
.Append("').focus();")
.Append("</script>")
End With

RegisterStartupScript("setFocus", Script.ToString())
End Sub
 
Select All (1) Not working:
 

Private Sub SelectAll1(ByVal FocusControl As Control) 'not working

'Sub provide SetFocus functionality....go over with Bill

Dim Script As New System.Text.StringBuilder
Dim ClientID As String = FocusControl.ClientID
With Script
.Append("<script language='javascript'>")
.Append("document.getElementById('")
.Append(ClientID)
.Append("').select();")
.Append("</script>")
End With

RegisterStartupScript("SelectAll1", Script.ToString())
End Sub
 
Select All (2) Not working:
 

Private Sub SelectAll(ByVal ctrl As Control) 'trying different ways to make this work

Dim selectScript As String = "<script language='javascript'>" & _
"document.getElementById('" + ctrl.ClientID & _
"').select();</script>"
RegisterStartupScript("SelectScript", selectScript)
End Sub

other way, if u use ajax in form

scriptmanager1.setfocus(control ID)