vb.net - Inserting text after specific tag -

i have text file comprised of different tags. able find out if specific tag exists within document using following...

public class form1  private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click     dim text string = io.file.readalltext("c:\example.xtp")     dim index integer = text.indexof("<tools>")     if index >= 0         ' string in file, starting @ character "<tools>" insert text "test_hello"      end if end sub end class 

however want enter text after tag when / if found

i using vb.net

try:

private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click     dim text string = io.file.readalltext("c:\example.xtp")     dim index integer = text.indexof("<tools>")     dim countchars integer     countchars="<tools>".length     if index >= 0        ' string in file, starting @ character "<tools>" insert text "test_hello"         text = text.insert(index + countchars, "test_hello")     end if end sub 

edit if want write final text a/the file , there many ways. suggest one, need search , read , find suitable you:

dim writer system.io.streamwriter writer = new system.io.streamwriter("c:\textfile.txt") '<-- write writer.write(text) writer.close()