在我看来，如果你想说一个按钮，或复选框，或下拉菜单？
为什么不把它添加到标记中呢。
所以，这样说：

<div id="MyGridPick" runat="server" style="display:normal;width:40%">
    <asp:Label ID="lblSel" runat="server" Text="" Font-Size="X-Large"></asp:Label>
    <br />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID"  cssclass="table table-hover" OnRowDataBound="GridView1_RowDataBound" >
        <Columns>
            <asp:BoundField DataField="FirstName" HeaderText="FirstName"     />
            <asp:BoundField DataField="LastName" HeaderText="LastName"       />
            <asp:BoundField DataField="City" HeaderText="City"                />
            <asp:BoundField DataField="HotelName" HeaderText="HotelName" ItemStyle-Width="120px"     />
            <asp:BoundField DataField="Description" HeaderText="Description" />
            <asp:TemplateField HeaderText="Select" ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:CheckBox ID="chkSel" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

那么我要加载的代码是这样的：

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            LoadGrid();
    }

    void LoadGrid()
    {
        SqlCommand cmdSQL = 
            new SqlCommand("SELECT * FROM tblHotelsA ORDER BY HotelName");
        GridView1.DataSource = MyRstP(cmdSQL);
        GridView1.DataBind();
    }

当然，我已经厌倦了一遍又一遍地输入连接字符串，所以，我有一个"genreal"例程，如下所示：

public DataTable MyRstP(SqlCommand cmdSQL)
    {
        DataTable rstData = new DataTable();
        using (SqlConnection conn = new SqlConnection(Properties.Settings.Default.TEST4))
        {
            cmdSQL.Connection = conn;
            using (cmdSQL)
            {
                conn.Open();
                rstData.Load(cmdSQL.ExecuteReader());
            }
        }
        return rstData;
    }

运行以上结果：

所以，当你可以直接把一个复选框放到网格视图中时，很难"添加"一个复选框控件。
按钮也是如此，也许我们需要一个按钮来"查看"或编辑上面的行，或者类似的东西。
所以，再一次，放一个简·巴顿，像这样说：

<asp:TemplateField HeaderText="View" ItemStyle-HorizontalAlign="Center" >
                <ItemTemplate>
                    <asp:Button ID="bView" runat="server" Text="View" CssClass="btn"
                        OnClick="bView_Click" />
                </ItemTemplate>
            </asp:TemplateField>

现在我们有了这个

甚至更好？
既然那个按钮（或复选框）是一个普通的jane标准控件？
然后你可以添加标准事件，比如点击事件，或者任何你想要的。
说出这段代码来点击按钮（显示如何获取当前行）。

protected void bView_Click(object sender, EventArgs e)
{
    Button btn = sender as Button;
    GridViewRow gRow = btn.NamingContainer as GridViewRow;
    int PKID = (int)GridView1.DataKeys[gRow.RowIndex]["ID"];

    SqlCommand cmdSQL = 
        new SqlCommand("SELECT * FROM tblHotelsA WHERE ID = @ID");
    cmdSQL.Parameters.Add("@ID", SqlDbType.Int).Value = PKID;

    DataTable dtHotel = MyRstP(cmdSQL);
    General.FLoader(MyEditArea, dtHotel.Rows[0]);

    MyGridPick.Style.Add("display", "none");        // hide grid
    MyEditArea.Style.Add("display", "normal");      // show edit div area

}

现在我们看到了：

编辑：处理每个选中/选定的行。

这个：

protected void cmdSelProcess_Click(object sender, EventArgs e)
{
    // process all rows in GV with check box

    String sPK = "";
    List<int> MySelected = new List<int>();
    foreach (GridViewRow gRow in GridView1.Rows)
    {
        CheckBox chkSel = (CheckBox)gRow.FindControl("chkSel");
        if (chkSel.Checked)
        {
            int PK = (int)GridView1.DataKeys[gRow.RowIndex]["ID"];
            // add pk value of row to our list
            MySelected.Add(PK);
            // Or we could process data based on current gRow
            if (sPK != "")
                sPK += ",";

            sPK += PK.ToString();
            Debug.Print(PK.ToString());
        }

    }
    // at this point, we have a nice list of selected in MySelected
    // or, maybe process as a data table

    SqlCommand cmdSQL =
        new SqlCommand($"SELECT * FROM tblHotelsA where ID IN({sPK})");

    DataTable rstSelected = MyRstP(cmdSQL);
    // 
    foreach (DataRow dr in rstSelected.Rows)
    {
        // do whatever
    }

}

Datagridviewcheckboxcolumn是Windows formx对象。您正在使用Web窗体。有关webforms check box field的信息，请参阅下面的链接

CheckBoxField checkColumn = new CheckBoxField();