Template checkbox in Gridview is selected but returning false when running the code

Question

I have used template CheckBox in gridview for multiple rows deletion, when I select multiple rows by selecting the CheckBox and perform the delete operation it seems to be selected CheckBox is not returning true on the code below.

protected void Button6_Click(object sender, EventArgs e)

        {

            foreach (GridViewRow row in GridView1.Rows)

            {

                LinkButton ch = new LinkButton();

                ch = (LinkButton)row.FindControl("l1");

                id = Convert.ToInt16(ch.CommandArgument);

                CheckBox chs = new CheckBox();

                chs = ((CheckBox)row.FindControl("c1"));

                if (chs.Checked == true)

                {

                    DeleteSelected(id);

                }

            }

        }

    private void DeleteSelected(short id)

    {

        var ch = from a in empd.Employees where (a.ID == id) select a;

        empd.Employees.DeleteAllOnSubmit(ch);

        empd.SubmitChanges();

        display_emp();

    }

Well now I have fixed the connection everything, please just refresh the database.Please get the web application in the below link.

<a href=http://www.ziddu.com/download/20716096/WebApplication.zip.html>http://www.ziddu.com/download/20716096/WebApplication.zip.html</a>

Please help me on why selected checkbox are not returning true in the code.