GridView遍历各行的控件和控件事件

<div>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
onrowcommand="GridView1_RowCommand" DataKeyNames="ID">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ID" />
<asp:BoundField DataField="Name" />
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="Button2" runat="server" Text="Button" CommandArgument="ID"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>

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

DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(string));
dt.Columns.Add("Name", typeof(string));
for (int i = 0; i < 5; i++)
{
DataRow dr = dt.NewRow();
dr["ID"] = "ID" + i.ToString();
dr["Name"] = "Name" + i.ToString();
dt.Rows.Add(dr);
}
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
foreach (GridViewRow row in GridView1.Rows)
{
CheckBox ckb = (CheckBox)row.Cells[0].FindControl("CheckBox1");
ckb.Checked = true;
}
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandArgument == "ID")
{
GridViewRow row = ((Button)e.CommandSource).Parent.Parent as GridViewRow;
CheckBox ckb = (CheckBox)row.Cells[0].FindControl("CheckBox1");
ckb.Checked = false;
}
}