C#-WebForm-网页中Form表单中给回车绑定按钮

    <form id="form1" runat="server" defaultbutton="btnSearch">
        <div>
            <asp:TextBox ID="tbSearch" runat="server"></asp:TextBox>
            <asp:Button ID="btnSearch" runat="server" Text="搜索" OnClick="OnSearch" />
        </div>
    </form>

    protected void OnSearch(Object sender, EventArgs e)
    {
        
    }