vb.net - Don't allow editing a textbox once it was filled, allow only entering new values -


i have mathematical calculation program.
want cycle between textboxes pressing tab button , must select value in textbox.
can use program entering new values (i don't want allow backspace delete current values).

currently, there blinking cursor @ right of value.

note: i'm using visual studio 2013

use .selectall when text box got focus

private sub textbox1_gotfocus(sender object, e system.eventargs) handles textbox1.gotfocus         textbox1.selectall() end sub

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