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how to create an else if statement in Razor?
@model MvcApplication3.Models.ViewModels.New.Question.MatrixRows

@{
    bool visible = Model.Visible;
}

<tr>
    <td>
    @if(visible)
        {
        @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1 })
        }
    @if (!visible)
        {
        @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1, disabled = "disabled" })
        }
    </td>
    <td>
    @if(visible)
        {
            @Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45 })
        }
    @if (!visible)
    {
        @Html.TextBoxFor(bs => Model.Row_Description, new { @class = "rowdesc", size = 45, disabled = "disabled" })
    }
    </td>
    <td>
        @if (HttpContext.Current.User.IsInRole("Administrator"))
        {
            @Html.HiddenFor(x => x.Delete, new { @class = "mark-for-delete" })
            @Html.LinkToRemoveNestedForm("Slet", "tr", "input.mark-for-delete")
        }
        @if (HttpContext.Current.User.IsInRole("Moderator"))
        {
            @Html.HiddenFor(x => x.Visible, new { @class = "mark-for-visible" })
            @Html.LinkToDisableNestedForm("Deaktiver", "tr", "input.mark-for-visible")
        }
        @Html.HiddenFor(id => Model.Row_Id)
    </td>
</tr>

@{
    ViewBag.Title = "Home Page";
}

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

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

@if(visible)
    {
    @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1 })
    }
else
    {
    @Html.TextBoxFor(cn => Model.Row_Number, new { @class = "row required digits", size = 1, disabled = "disabled" })
    }

@{
    bool visible = Model.Visible;
    ViewBag.Title = "My Title;
}