Use JavaScript to implement the full selection function (gridview)

The result is as follows:

Front-end JS:

 <  Script Language  =  "  Javascript  "  Type  =  "  Text/JavaScript  "  >  
VaR list  =  Document. getelementsbyname ( "  Ch  "  );
Window. onload  =  Function ()
{
  For  (VAR I  =  0  ; I  <  List. length; I  ++  )
{
List [I]. onclick  = Chkclick;
}
}
Function chkclick ()
{
VaR listvar  =  ""  ;
  For  (VAR I  =  0  ; I  <  List. length; I  ++  )
{
  If  (List [I].  Checked )
{
Listvar  + =  List [I]. Value  +  "  ,  "  ;
}
}
Document. getelementbyid (  "  Hiddenfield1  "  ). Value  =  Listvar. substring (  0 , Listvar. Length  -  1  );
}
Function allclick ()
{
VaR C  =  Document. getelementbyid (  "  Chk  "  );

  If  (C.  Checked  )
{
VaR listvar  = ""  ;

  For  (VAR I  =  0  ; I  <  List. length; I  ++  )
{
List [I].  Checked  =  True  ;

Listvar  + = List [I]. Value  +  "  ,  "  ;
}

Document. getelementbyid (  "  Hiddenfield1  "  ). Value  =  Listvar;  //  . Substring (0, listvar. Length-1 );  
  
}
 Else  
{
  For  (VAR I  =  0  ; I  <  List. length; I  ++  )
{
List [I].  Checked  =  False  ;

}
Document. getelementbyid (  " Hiddenfield1  "  ). Value  =  ""  ;
}
}
  </  Script  > 

Front-end:

 <  ASP: gridview ID  =  "  Gridview1  "  Autogeneratecolumns =  "  False  "  Runat  =  "  Server  "  >  
  <  Columns  >  
  <  ASP: templatefield headertext =  "  Select All  "  >  
  <  Itemtemplate  >  
  <  Input name  =  "  Ch  "  Value  = "  <% # Eval (  "  Stu_no  "  ) %>  "  Type  =  "  Checkbox  "     />  
  </  Itemtemplate  > 
  </  ASP: templatefield  >  
  <  ASP: boundfield datafield  =  "  Stu_no  "  Headertext  =  "  Student ID  "    />  
  <  ASP: boundfield datafield  =  "  Stu_name  "  Headertext  =  "  Name  "     />  
  < ASP: boundfield datafield  =  "  Stu_sex  "  Headertext  =  "  Gender  "     />  
  </  Columns  >  
 </  ASP: gridview  >  
  <  Input ID  =  "  Chk  "  Onclick  =  "  Allclick ()  "  Type  =  " Checkbox  "     /> <  ASP: hiddenfield ID  =  "  Hiddenfield1  "  
Runat  =  "  Server  "     />  
 <  ASP: button ID  =  "  Button1  "  Runat  =  "  Server  "  Onclick  =  "  Button#click  "  Text  = "  Button  "     /> </  Div  > 

BackgroundCode:

View code

 Protected     Void  Button#click (  Object  Sender, eventargs E)
{
  String S  =     This  . Hiddenfield1.value;
  String  [] SS  =  S. Split (  '  ,  '  );
Sqlconnection con  =     New  Sqlconnection ( @"  Data Source =. \ sqlexpress; initial catalog = northwind; Integrated Security = true  "  );

  For  (  Int  I  =     0  ; I  <     This  . Gridview1.rows. Count; I ++  )
{
Sqlcommand cmd  =     New  Sqlcommand ();
Cmd. Connection  =  Con;
Cmd. commandtext  =     "  Delete from university student information table where stu_no = @ stu_no  "  ;
Sqlparameter sp  =    New  Sqlparameter (  "  @ Stu_no  "  , Sqldbtype. nchar,  10  );
Sp. Value  =  Ss [I];
Cmd. Parameters. Add (SP );
Con. open ();
Cmd. executenonquery ();
Con. Close ();

}
Databind ();
}