how to load data from ms sql to jqGrid

$("#jqgEmpSearch").jqGrid({
   url:"Servicelibrary/employeesearch.aspx",  //?empid="+$("[id*=txtSrchEmpID]").val()+""
   datatype:"json",
   colNames:['Emp Number','Emp Name'], // UM_Employee_Number UM_FirstName
   colModel:[
             {name:'UM_Employee_Number', index:'UM_Employee_Number',width:'150'},
             {name:'UM_FirstName', index:'UM_FirstName',width:'150'}
            ],
   rowNum:5,
   rowList:[5, 10,20,30,40,50],
   pager:'#jqgEmpSearchPager',
   sortname:'EmpNum',
   viewrecords:true,
   pager:'#jqgDiv',
   caption:"Employee Search Result",
   loadonce:true

});