在Gridview中经常会用到CheckBox，选中单行或者多行，在Gridview下面又增加一个CheckBox，点击全选，如图
但是，我遇到的问题是，全选之后又单击其中一个Checkbox,但是下面的全选checkbox并没有取消。上网查找解决方法，直接上代码：
前台代码：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:GridView ID="gv" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True"
oncheckedchanged="chk1_CheckedChanged"/>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="no" HeaderText="学号" SortExpression="no" />
<asp:BoundField DataField="name" HeaderText="姓名"/>
<asp:BoundField DataField="age" HeaderText="年龄"/>
<asp:BoundField DataField="sex" HeaderText="性别"/>
<asp:BoundField DataField="addr" HeaderText="住址" />
</Columns>
</asp:GridView>
全选<asp:CheckBox ID="CheckBox2" runat="server" AutoPostBack="True"
oncheckedchanged="CheckBox2_CheckedChanged" />
<asp:Button ID="btnCancel" runat="server" Text="Cancel" />
<asp:Button ID="btnDelete" runat="server" Text="Delete" />
</form>
</body>
</html>
后台代码：
public partial class Gridview : System.Web.UI.Page
{
string constr = ConfigurationManager.ConnectionStrings["connString"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
bind();
}
}
protected void bind()
{
string sql="select stu_no as no ,stu_name as name ,stu_age as age ,stu_sex as sex,stu_addr as addr from StudentInfo";
gv.DataSource = SqlHelper.ExecuteDataset(constr,CommandType.Text,sql).Tables[0];
gv.DataBind();
}
protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
{
for (int i = 0; i <= gv.Rows.Count - 1; i++)
{
CheckBox cbox = (CheckBox)gv.Rows[i].FindControl("CheckBox1");
if (CheckBox2.Checked == true)
{
cbox.Checked = true;
}
else
{
cbox.Checked = false;
}
}
}
protected void chk1_CheckedChanged(object sender, EventArgs e)
{
CheckBox checkbox = (CheckBox)sender;
if (checkbox.Checked == false)
{
CheckBox2.Checked = false;
}
}
}
}