ObjectDataSource error

I have a gridview (points of interest)

DataKeyNames="ID"
<asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" ItemStyle-Width="100" />
<asp:BoundField DataField="DESCRIPTION" HeaderText="Description" SortExpression="DESCRIPTION" />

bound to an objectdatasource

<asp:ObjectDataSource ID="dataSource" runat="server"
                DeleteMethod="Delete"
                InsertMethod="Insert"
                SelectMethod="Get"
                TypeName="MyData.MyClass"
                UpdateMethod="Update"
                >
                <SelectParameters>
                    <asp:Parameter Name="descrip" Type="String" />
                </SelectParameters>
                  <DeleteParameters>
                        <asp:Parameter Name="id" Type="Int32" />
                  </DeleteParameters>
                  <UpdateParameters>
                        <asp:FormParameter Name="id" Type="Int32" />
                    <asp:FormParameter Name="descrip" Type="String" />
                  </UpdateParameters>
                  <InsertParameters>
                    <asp:Parameter Name="descrip" Type="String" />
                  </InsertParameters>
            </asp:ObjectDataSource>

This is the method being called to update my table
      public void Update(int id, string descrip)
        {

            // create input parameter
            SqlParameter[] inparms = new SqlParameter[2];
            inparms[0] = new SqlParameter("@ID", SqlDbType.Int);
            inparms[1] = new SqlParameter("@DESCRIPTION", SqlDbType.VarChar);

            inparms[0].Value = id;
            inparms[1].Value = descrip;

            using (DAL data = new DAL())
            {
                data.ReturnNonQuery("up_NWCS_Admin_UpdateCommodity", inparms);
            }
        }

And this is the function takling to the database:
      public  int ReturnNonQuery(string sproc, SqlParameter[] p)
        {
            using (SqlConnection con = new SqlConnection(strConn))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.Connection = con;
                    cmd.CommandText = sproc;
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.AddRange(p);
                    con.Open();
                    int i = cmd.ExecuteNonQuery();
                    return i;
                }
            }
        }

When i click update on my gridview i get the following error

ObjectDataSource 'dataSource' could not find a non-generic method 'Update' that has parameters: id, descrip, ID, DESCRIPTION.

Yes i tried adding OldValuesParameterFormatString="{0}" but it still fails with the same error. I looked everywhere now im turning to the experts.