Insert checkbox checked value when checked to textbox as comma seperated string

Insert checkbox checked value when checked to textbox as comma seperated string in vb.net or javascript

suppose i have 3 checkboxes and and 1 textboxes in my webpage.aspx

when i checked checkbox1 and checkbox2 then in textbox it will appear as 1,2 only on checkboxes checked event ...

and i want its revert also :

if i set textbox 开发者_C百科de

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It should pretty straight forward

Checkbox should have the following event

OnCheckedChanged see here for more reference http://www.w3schools.com/aspnet/control_checkbox.asp.

In that event update the textbox count , like that bind the events and whenever event is changed please update the text box.

 textbox.Text=""; // textbox should be the id of textbox control

it should be pretty straigforwad

as you didn't provide too many details , i am providing you an approach