How to SELECT atmost one checkbox in a template column of gridview USING JAVASCRIPT

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You mean only one check box allowed to checked if so you can do it using JQuery in such a manner


#1:- In template Column write the checkbox ID like 
         <asp:checkbox id="chk_"+ID onclick="SelectOne(ID);">

ID will be  PK fields which you are getting from database 

 funtion SelectOne(Id){
  //find all the checkbox into the grid unchecked   
 $('input[id*="chk_"]').removeAttr("checked");
// then make checked what you have clicked 
 $("#chk_" + Id ).attr("checked", "checked"); 
}

TRY THIS WILL WORK IF ANY ISSUE WRITE ME 

THANKS