How to access (get) value of HTML TextArea Control in Code Behind in ASP.Net

1. With runat="server"

 <form id="form1" runat="server">
    <div>
        <textarea id="txtCommentBox" runat="server" cols="50" rows="8"></textarea>
        <br />
        <asp:Button runat="server" Text="Save" OnClick="Save" />
    </div>
    </form>

protected void Save(object sender, EventArgs e)
{
   string text = this.txtCommentBox.InnerText;
}

2. Without runat="server"

 <form id="form1" runat="server">
    <div>
        <textarea id="txtCommentBox" name = "txtCommentBox_1" cols="50" rows="8"></textarea>
        <br />
        <asp:Button runat="server" Text="Save" OnClick="Save" />
    </div>
    </form>

protected void Save(object sender, EventArgs e)
{
   string text = Request.Form["txtCommentBox_1"];
}