MeineVariableString.toCharAray()
'oder
MaineVariableString.Char(i)

Dim FirstChar as Char
FirstChar = MeineVariableString.Chars(0)

dim c as Char
dim chars as Char()
 
chars = MeinString.toCharArray()
for each c in chars
   'lauft das Array durch.
next
 
'oder
 
for i as integer=0 to MeinString.Chars.Count - 1 Step 1
c = MainString.Chars(i)
next i

Dim MeinNeuerString as new String(MeinCharArray)