Select All Check Box In Asp .Net With Java Script

Add This Code In Header Section Of your Aspx Page
1.

   1:  <script type="text/javascript">   

   2:     function SelectAllAndDeSelectAllCheckBox(Chk)

   3:  { 

   5:        var oItem = Chk.children; 

   6:      var theBox= (spanChk.type=="checkbox") ? Chk: Chk.children.item[0]; 

   7:       xState=theBox.checked;  

   8:       elm=theBox.form.elements; 

    9:       for(i=0;i 
  10:    
  11:           if(elm[i].type=="checkbox" && elm[i].id!=theBox.id)  
  13:           {   
  16:             if(elm[i].checked!=xState)    
  19:           }
  20:  script>

After The Add this code in Header Section You Need take A Grid View and Write This Code ..

   1:   

   2:  <asp:templatefield headertext="Select">

   3:    <headertemplate>  

   4:    <input blogger_onclick="javascript:SelectAllAndDeSelectAllCheckBox(this);"  

         id="chkAll" runat="server" type="checkbox">  

   5:   headertemplate> 

   6:    <itemtemplate>

   7:   <asp:checkbox blogger_oncheckedchanged="CheckBox1_CheckedChanged"  

         id="CheckBox1" runat="server" autopostback="true">

   8:    asp:checkbox>itemtemplate>

   9:   asp:templatefield>




Hope This Help You