c# - Restricting number of continuous comma in a textbox -

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how limit number of continuous 'comma' in textbox?...ex should not allow user enter more 2 comma continuously

this should handle scenarios, believe:

private void textbox_textchanged(object sender, eventargs e) {     textbox tb = sender textbox;     if (tb != null)     {         int pos = tb.selectionstart;         int length = tb.text.length;         tb.text = tb.text.replace(",,", ",");         int diff = length- tb.text.length;         tb.selectionstart = pos == 0 || diff == 0 ? pos : pos - diff;     } }

this works when type text textbox, when paste text it.


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