GridView中取HyperLinkField列和ButtonField列的值的问题

因为需要对GridView中HyperLinkField列和ButtonField列的取值，搜索了一下看到好多资料都是这样写的：  
           string str = ((HyperLink)row.Cells[1].Controls[0]).Text;
           string str2 = ((Button)row.Cells[2].Controls[0]).Text;   //注意红色部分
可是我这样取的话会报：无法将类型为“System.Web.UI.WebControls.DataControlLinkButton”的对象强制转换为类型“System.Web.UI.WebControls.Button”。

。。。。。。。

我是这样写的：
            string str = ((HyperLink)row.Cells[1].Controls[0]).Text;
            string str2 = ((LinkButton)row.Cells[2].Controls[0]).Text;  //应该是LinkButton类型的

下面代码，主要是记录下来怎样New 一个 DataTable 并添加数据的代码。留作自己备用。
HTML中代码：
    

HTML部分的代码
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" >
            <Columns>
                <asp:TemplateField  HeaderText="选择">
                    <HeaderStyle Width="4%"></HeaderStyle>
                    <ItemTemplate >
                        <FONT face="宋体">
                            <asp:CheckBox id="chkID" runat="server"></asp:CheckBox></FONT>
                    </ItemTemplate>
                    <ItemStyle Width="5%" HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:HyperLinkField  DataNavigateUrlFields="UserCode"
                                        DataTextField="UserCode" HeaderText="Code" >
                                        <ItemStyle Width="10%" />
                </asp:HyperLinkField>
                <asp:ButtonField DataTextField="UserName" HeaderText="Name" Text="按钮" />
                <asp:BoundField DataField="UserSex" HeaderText="Sex" />
            </Columns>
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

后台代码：

后台添加数据

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            DataTable dt = new DataTable();
            DataColumn dc1 = new DataColumn("UserCode",Type.GetType("System.String"));
            DataColumn dc2 = new DataColumn("UserName", Type.GetType("System.String"));
            DataColumn dc3 = new DataColumn("UserSex", Type.GetType("System.Int32"));

            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);
            dt.Columns.Add(dc3);


            DataRow dr = dt.NewRow();

            dr["UserCode"] = "Code 1";
            dr["UserName"] = "Name 1";
            dr["UserSex"] = 1;

            dt.Rows.Add(dr);

            GridView1.DataSource = dt;

            GridView1.DataBind();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int i = 1;
        foreach (GridViewRow row in this.GridView1.Rows)
        {
            //if (i == 5)
            //{
            string str = ((HyperLink)row.Cells[1].Controls[0]).Text;

            string str2 = ((LinkButton)row.Cells[2].Controls[0]).Text;

            string str3 = row.Cells[3].Text.Equals("1") ? "男" : "女";

            Page.ClientScript.RegisterStartupScript(this.GetType(),"alert","alert('"+str + "\\r\\n" + str2 + "\\r\\n" + str3+"');",true);
            //}
            //i++;

        }
    }