Validating DataList. when datalist count is zero

Question

 -

 here i am  uploading company products, after that i am saving  all products into databas.

i want give the RequiredFieldValidator to DataList,  when  DataList is empty.

and also display in ValidationSummary  

 

// if (DataListCProductsImgs.Items.Count=0 ) 

 //       RequiredFieldValidator  Fire ---"Upload  one product" 

 

i want to do in javascript or jquer ... 

i tryed.. 

custom validator  , But  ControlToValidate= ?

function gettotalRows(sender, arguments)

{

var totalRowCount = $("[id*=DataListCompanyImgs] tr").length;

if(totalRowCount>0)

{

      arguments.IsValue = true;

}

}

 

is there any another method.. to validate clientside.

Help me ..

 

Thanks