How to get item value from gridview use linq binding?

Question

I use linq bind data to gridview, code behide that:

     public partial class WebForm1 : System.Web.UI.Page
    {
        DataContext sqlContext = new DataContext();
        protected void Page_Load(object sender, EventArgs e)
        {
            var _Agent = from c in sqlContext.Agents
                           select c;
            GridView1.DataSource = _Agent;
            GridView1.DataBind();
        }
        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            DataRowView dRowView = (DataRowView)e.Row.DataItem;
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if ((e.Row.RowState & DataControlRowState.Edit) > 0)
                {
                    RadioButtonList _rblGender = (RadioButtonList)e.Row.FindControl("rblGender");
                    _rblGender.SelectedValue = dRowView[3].ToString();
                }
            }
        }
    }

I can't get value from gridview. It return error:

Unable to cast object of type '<>f__AnonymousType0`11[System.Int32,System.String,System.String, System.String,System.String,System.String,System.String,System.Nullable`1[System.DateTime], System.String,System.String,System.String]' to type 'System.Data.DataRowView'.

Line 28:         protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
Line 29:         {
Line 30:             DataRowView dRowView = (DataRowView)e.Row.DataItem;
Line 31:             if (e.Row.RowType == DataControlRowType.DataRow)
Line 32:             {

Please help me!

Thanks