In the Asp.net gridview control, the template column checkbox is fully selected, deselected, and canceled.

CopyCode The Code is as follows: using system;
Using system. Data;
Using system. Data. sqlclient;
Using system. configuration;
Using system. collections;
Using system. Web;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;
Using system. Web. UI. htmlcontrols;

Public partial class demo18: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
If (page. ispostback = false)
{
Binddata ();
}
}

Public void binddata ()
{
String strsql = "select userid, c_name, e_name, updatadate, isdy from demo_user ";
Datatable dt = sqlhelper. executedataset (sqlhelper. conn_string, commandtype. Text, strsql, null). Tables [0];

Gridview. datasource = DT;
Gridview. datakeynames = new string [] {"userid"}; // primary key
Gridview. databind ();
}

Protected void gridview_pageindexchanging (Object sender, gridviewpageeventargs E)
{
Gridview. pageindex = E. newpageindex;
Binddata ();
}

Protected void button#click (Object sender, eventargs E)
{
Checkboxall. Checked = false;
Checkbox1.checked = false;
For (INT I = 0; I <= gridview. Rows. Count-1; I ++)
{
Checkbox = (checkbox) gridview. Rows [I]. findcontrol ("checkbox ");
Checkbox. Checked = false;
}

}

Protected void button2_click (Object sender, eventargs E)
{
For (INT I = 0; I <= gridview. Rows. Count-1; I ++)
{
Checkbox = (checkbox) gridview. Rows [I]. findcontrol ("checkbox ");
If (checkbox. Checked = true)
{
String strsql = "Update demo_user set updatadate = @ updatadate where userid = @ userid ";
Sqlparameter [] para = {
New sqlparameter ("@ updatadate", datetime. Now ),
New sqlparameter ("@ userid", gridview. datakeys [I]. value ),
};
Sqlhelper. executenonquery (sqlhelper. conn_string, commandtype. Text, strsql, para );
}
}
Checkboxall. Checked = false;
Checkbox1.checked = false;
Binddata ();

}

Protected void checkboxall_checkedchanged (Object sender, eventargs E)
{
For (INT I = 0; I <= gridview. Rows. Count-1; I ++)
{
Checkbox = (checkbox) gridview. Rows [I]. findcontrol ("checkbox ");
If (checkboxall. Checked = true)
{
Checkbox. Checked = true;
}
Else
{
Checkbox. Checked = false;
}
}
Checkbox1.checked = false;

}

Protected void checkbox#checkedchanged (Object sender, eventargs E)
{
For (INT I = 0; I <= gridview. Rows. Count-1; I ++)
{
Checkbox = (checkbox) gridview. Rows [I]. findcontrol ("checkbox ");
If (checkbox. Checked = false)
{
Checkbox. Checked = true;
}
Else
{
Checkbox. Checked = false;
}
}
Checkboxall. Checked = false;
}
}

<Table align = "center" bgcolor = "# c0de98" border = "0" cellpadding = "0" cellspacing = "1" width = "99%">
<Tr>
<TH colspan = "2">
Gridview demonstration </Th>
</Tr>
<Tr>
<TD colspan = "2" style = "width: 100%;">
<Asp: gridview id = "gridview" runat = "server" width = "100%" autogeneratecolumns = "false" allowpaging = "true" onpageindexchanging = "gridview_pageindexchanging" pagesize = "12">
<Columns>
<Asp: templatefield headertext = "select">
<Itemtemplate>
<Asp: checkbox id = "checkbox" runat = "server"/>
</Itemtemplate>
</ASP: templatefield>
<Asp: boundfield datafield = "userid" headertext = "userid" readonly = "true"/>
<Asp: boundfield datafield = "c_name" headertext = "Chinese name" readonly = "true"/>
<Asp: boundfield datafield = "e_name" headertext = "English name" readonly = "true"/>
<Asp: boundfield datafield = "updatadate" headertext = "Update Time"/>
</Columns>
<Rowstyle horizontalalign = "center"/>
<Pagerstyle horizontalalign = "right"/>
</ASP: gridview>
</TD>
</Tr>

<Tr>
<TD>
<Asp: checkbox id = "checkboxall" runat = "server" text = "select all" width = "80px" autopostback = "true" oncheckedchanged = "checkboxall_checkedchanged"/>
<Asp: checkbox id = "checkbox1" runat = "server" text = "invert" width = "80px" autopostback = "true" oncheckedchanged = "checkbox#checkedchanged"/>
<Asp: button id = "button1" runat = "server" text = "Remove" cssclass = "button" onclick = "button#click"/>
<Asp: button id = "button2" runat = "server" text = "Update Time" cssclass = "button" onclick = "button2_click"/> </TD>
</Tr>
</Table>