Problems Binding GridView with LINQ

[finie]

Hi, I'm using Linq to bind a gridview and when I debug I get this exception:
"Input string was not in a correct format."
this function loads with the Form

 
private void DGVWCcode_Changed()
        {
            SalaryDClassesDataContext dc = new SalaryDClassesDataContext();
            BindingSource bs = new BindingSource();
            var wcmpnnts = from c in dc.Wage_Components
                           where c.EmployerID == int.Parse(tbEmplyrId.Text)
 
                  select new
                  {
                    ComponentCode = c.cmpnntCode,
                    ComponentDiscrition= c.cmnntDscrpt,
          };
 
            DGVWCcodes.DataMember = null;
            bs.DataSource= wcmpnnts;/****here I get the exception***/
            DGVWCcodes.DataSource = bs;
        }

is it because my DBis Still empty and can't get null cells?
if not can you tell me what the problem is?