How to achieve the summary of the total selection method when deleting records in batches _ practical skills

Large batch of data deletion, if there is a full selection button to multiple pages displayed on the record all selected to delete that than a strip of the deletion of more humane, next to say how to achieve, in fact, a lot of articles on the Internet are said how to delete the bulk, can be divided into two major categories of 1: The use of JS script to achieve a full selection. 2: The server-side implementation of the full selection
First of all, say how to use JS to achieve a full selection
Drag a GridView to the page, set up the data source, add a template column to the GridView, and add a chekcbox to the template column, such as the following code

<asp:gridview id= "GridView1" runat= "Server" autogeneratecolumns= "False" datakeynames= "ProductID"
Datasourceid= "SqlDataSource1" >
<Columns>
<asp:boundfield datafield= "ProductID" headertext= "ProductID" insertvisible= "False"
Readonly= "True" sortexpression= "ProductID"/>
<asp:boundfield datafield= "ProductName" headertext= "ProductName" sortexpression= "ProductName"/>
<asp:boundfield datafield= "SupplierID" headertext= "SupplierID" sortexpression= "SupplierID"/>
<asp:boundfield datafield= "CategoryID" headertext= "CategoryID" sortexpression= "CategoryID"/>
<asp:TemplateField>
<ItemTemplate>
<asp:checkbox id= "Chk_del" runat= "Server"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView> Add a CheckBox control to the Contacts page
<asp:checkbox id= "Chk_js" runat= "Server" text= "Select All (JS)" onclick= "SelectAll" (This)/>
and write the JS script for the control as follows: <script type= "Text/javascript" >
Sets the selected state of all the checkbox based on the checked state of the incoming checkbox
function SelectAll (obj)
{
var allinput = document.getelementsbytagname ("input");
alert (allinput.length);
var looptime = allinput.length;
for (i = 0;i < looptime;i++)
{
alert (Allinput[i].type);
if (Allinput[i].type = "checkbox")
{
allinput[i].checked = obj.checked;
}
}
}
</script> The basic effect is there, and then we're decorating it. Add a button to a Web page
<asp:button id= "btn_deleterecords" runat= "Server" onclientclick= "return Judgeselect ();" text= "Delete checked records"/>
Add JS Script
Determine if the record is checked and the user confirms the deletion
function Judgeselect ()
{
var result = false;
var allinput = document.getelementsbytagname ("input");
var looptime = allinput.length;
for (i = 0;i < looptime;i++)
{
if (allinput[i].checked)
{
result = true;
Break
}
}
if (!result)
{
Alert ("Please select the record you want to delete!") ");
return result;
}
result = Confirm ("Are you sure you want to delete the selected records?") ");
return result;
}
2 Implementing the full selection via server-side code
Add a checkbox to the page and set the AutoPostBack property to True and add a checkedchanged event to it
<asp:checkbox id= "Chk_server" runat= "Server" oncheckedchanged= "chk_server_checkedchanged" Text= "Select All (Server)" autopostback= "True"/>
The event code is as follows

int a = this. GridView1.Rows.Count;
for (int i = 0; i < A; i++)
{
CheckBox chk = (checkbox) this. Gridview1.rows[i]. FindControl ("Chk_del");
Chk. Checked = this.chk_Server.Checked;
}