keyup or onclick event for checkbox generated server side

Does anyone know the syntax for setting a click event or keyup event on a checkbox in the following c# code? I'm trying to set the 3rd parameter htmlAttributes (after the 2nd parameter of true, see below:

Response.Write(Html.CheckBox("chkStatus_" + item.Value, true) + " " 
    开发者_运维知识库                                      + item.Text + "<br />");

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This should do the trick:

<%= Html.CheckBox("chkStatus_" + item.Value, true, 
                                  new { onclick = "doSomething();" }); %>

or Razor

@Html.CheckBox("chkStatus_" + item.Value, true, 
                                  new { onclick = "doSomething();" })