Validation to choose from two textboxes in asp.net

refer this link http://www.codeproject.com/Questions/65550/Access-Gridview-Footer-cell-via-Javascript...when u browse ur page view page source get id of TxtCompanyTagNo and TxtEmployeeTagNo.. and place in below code at place of gvEmp_ctl06_TxtEmployeeTagNo and gvEmp_ctl06_TxtCompanyTagNo

<asp:TextBox ID="TxtCompanyTagNo" runat="server">
<asp:TextBox ID="TxtEmployeeTagNo" runat="server">
<asp:CustomValidator id="CustomValidator1" runat="server"
ErrorMessage="CompanyTagNo or EmployeeTagNo Required"
Display="Dynamic"
ClientValidationFunction="CompanyTagOrEmployeeTag()" />
<script type="text/javascript">
function CompanyTagOrEmployeeTag()
{
var text=document.getElementById("gvEmp_ctl06_TxtEmployeeTagNo");
var text2=document.getElementById("gvEmp_ctl06_TxtCompanyTagNo");
if (text.value =="" && text2.value == "" )
{
alert('CompanyTagNo or EmployeeTagNo Required');
return false;
}
else
{

return true;
}
}
</script>
i think it should work

i am trying to tell u that when u run this page of gridview all control id of girdview r change ,that's why run page view it's page source get there id and use it...if both textbox are empty then it is showing alert...try once