How to create an else- if statement in View in MVC Razor

@model MvcApplication.Models.Models.DemoModel

@{
    bool visible = Model.Visible;
}

@if(visible)
{
Html.TextBoxFor(bs => Model.Row_Description,new{@class = "rowdesc", size = 45 })
}
else{
Html.TextBoxFor(bs => Model.Row_Description,new{ size = 45, disabled ="disabled")
}