vb.net - TextBox1.TextChanged event shows MsgBox twice -


i have problem textbox1.textchanged event. code :

private sub textbox1_textchanged(sender object, e eventargs) handles textbox1.textchanged     msgbox("txt changed")     textbox1.clear() end sub

the problem msgbox shown twice, want show 1 time , clear textbox. how can that?

two ways:

temporarily remove handler prevent event firing again:

private sub textbox1_textchanged(sender object, e eventargs) handles textbox1.textchanged     msgbox("txt changed")     removehandler textbox1.textchanged, addressof textbox1_textchanged     textbox1.clear()     addhandler textbox1.textchanged, addressof textbox1_textchanged end sub

or

create field check if event originating itself:

dim textboxalreadychanging boolean = false  private sub textbox1_textchanged(sender object, e eventargs) handles textbox1.textchanged     if not textboxalreadychanging         msgbox("txt changed")         textboxalreadychanging = true         textbox1.clear()         textboxalreadychanging = false     end if end sub

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