executing controller controller action method

i want to execute a controller action method soon after entering the data in a textbox glgroupcode

the action method takes glgroupcode textbox value as a parameter and result should get populated in another textbox .

the below is my jquery code and action method

@Html.TextBoxFor(model => model.GLGroupCode)

@Html.ValidationMessageFor(model => model.GLGroupCode )

@Html.LabelFor(model => model.GLGroupName)

@Html.TextBoxFor(model => model.GLGroupName, new { id = "txtSearch1" })

@Html.ValidationMessageFor(model => model.GLGroupName)

public JsonResult TextChanged(string GLGroupCode)

{

var subGroups = from p in db.tblGLGroups where p.GroupCode == GLGroupCode select p.GroupName;

return Json(subGroups, JsonRequestBehavior.AllowGet);

}