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hi u can limit textbox max length to 4, then use keypress event to validate entry: [code] private void [textbox]_keypress(object sender,keypressventArgs e) { if((!Char.IsControl(e.char))&&(!Char.Isdigit(e.char))) e.handled = true; } [/code] then use keyup event to catch enter pressed to add controls [code] private void [textbox]_keyup(object snder, keyeventargs e) { if (e.KeyCode …
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