如何在cshtml的选择列表中选择默认值？

<select id="mySelect">
    <option value="option1">Option 1</option>
    <option value="option2">Option 2</option>
    <option value="option3">Option 3</option>
</select>

<select id="mySelect">
    <option value="option1">Option 1</option>
    <option value="option2" selected>Option 2</option>
    <option value="option3">Option 3</option>
</select>

@{
    string defaultValue = "option2";
}

<select id="mySelect">
    <option value="option1" @(defaultValue == "option1" ? "selected" : "")>Option 1</option>
    <option value="option2" @(defaultValue == "option2" ? "selected" : "")>Option 2</option>
    <option value="option3" @(defaultValue == "option3" ? "selected" : "")>Option 3</option>
</select>