Problema com Classes

Amigos,     Estou com um problema Relacionado a op;áo de Delete por uma Classe,     Abaixo segue o Código da Página: <asp:GridView ID="grdRegiao" runat="server" AutoGenerateColumns="False" DataSourceID="dsRegiao" AllowPaging="True" DataKeyNames="CODIGO_REG"> <RowStyle CssClass="rowA" /> <Columns> <asp:TemplateField HeaderText="Edi‡Æo"> <ItemTemplate> <asp:LinkButton ID="lnkEdit" runat="server" CommandName="Select">Editar</asp:LinkButton> &nbsp; / <asp:LinkButton ID="lnkDelete" runat="server" CommandName="Delete" OnClientClick="return confirm('Deseja excluir esta REGIÇO? ')">Excluir</asp:LinkButton> </ItemTemplate> </asp:TemplateField> <asp:BoundField DataField="NOME_REG" HeaderText="RegiÆo" SortExpression="NOME_REG" /> </Columns> <HeaderStyle CssClass="rowH" /> <AlternatingRowStyle CssClass="rowB" /> </asp:GridView> <br /> <asp:ObjectDataSource ID="dsRegiao" runat="server" InsertMethod="Insert" SelectMethod="SelectRegiao" TypeName="Setri.Prominent.Regiao" DeleteMethod="DeleteRegiao"> <DeleteParameters> <asp:Parameter Name="CodigoId" Type="Int32" /> </DeleteParameters> <InsertParameters> <asp:Parameter Name="title" Type="String" /> </InsertParameters> </asp:ObjectDataSource>     Segue o Código da Classe:     using System; using System.Data; using System.Data.SqlClient; using System.Configuration; using System.Linq; using System.Web; using System.Web.Configuration; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Collections.Generic;     namespace Setri.Prominent { /// <summary> /// Classe de RegiÆo /// </summary> [System.ComponentModel.DataObject] public class Regiao { private static readonly string _connectionstring; private int _CODIGO_REG; private string _NOME_REG; public int CODIGO_REG { get { return _CODIGO_REG; } set { _CODIGO_REG = value; } } public string NOME_REG { get { return _NOME_REG; } set { _NOME_REG = value; } } static Regiao() { _connectionstring = WebConfigurationManager.ConnectionStrings["CsConexao"].ConnectionString; } public Regiao(SqlDataReader reader) { _CODIGO_REG = (int)reader["CODIGO_REG"]; _NOME_REG = (string)reader["NOME_REG"]; } /// <summary> /// Seleciona as Regiäes do Banco de Dados /// </summary> /// [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Select,true)] public static List<Regiao> SelectRegiao() { //Inicializa o Command SqlConnection con = new SqlConnection(_connectionstring); SqlCommand cmd = new SqlCommand("SelectRegiao",con); cmd.CommandType = CommandType.StoredProcedure; List<Regiao> results = new List<Regiao>(); using (con) { con.Open(); SqlDataReader reader = cmd.ExecuteReader(); while (reader.Read()) { results.Add(new Regiao(reader)); } con.Close(); return results; } }   [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Select, false)] public static Regiao SelecById(int CategoryID) { //Initialize command SqlConnection con = new SqlConnection(_connectionstring); SqlCommand cmd = new SqlCommand("SelectRegiaoByID",con); cmd.CommandType = CommandType.StoredProcedure; //Initialize parameters cmd.Parameters.AddWithValue("@CODIGO_REG", CategoryID); Regiao result = null; using(con) { con.Open(); SqlDataReader reader = cmd.ExecuteReader(); if(reader.Read()) result =new Regiao(reader); } con.Close(); return result; } //<summary> //Create a new category //</summary> //<param name="parentId"></param> [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Insert, true)] public static void Insert(string title) { //Initialize command SqlConnection con = new SqlConnection(_connectionstring); SqlCommand cmd = new SqlCommand("InsertRegiao ", con); cmd.CommandType = CommandType.StoredProcedure; //Initialize parameters cmd.Parameters.AddWithValue("@NOME_REG", title); using (con) { con.Open(); cmd.ExecuteNonQuery(); } con.Close(); }   /// <summary> /// Update an existing category /// </summary> [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Update, true)] public static void Update(int CODIGO_REG, string NOME_REG) { // Initialize command SqlConnection con = new SqlConnection(_connectionstring); SqlCommand cmd = new SqlCommand("UpdateRegiao", con); cmd.CommandType = CommandType.StoredProcedure; // Initialize parameters cmd.Parameters.AddWithValue("@CODIGO_REG", CODIGO_REG); cmd.Parameters.AddWithValue("@NOME_REG", NOME_REG); using (con) { con.Open(); cmd.ExecuteNonQuery(); } con.Close(); }   /// <summary> /// Select a Category by Category Id /// </summary> [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Select, false)] public static Regiao SelectById(int CodigoId) { // Initialize command SqlConnection con = new SqlConnection(_connectionstring); SqlCommand cmd = new SqlCommand("SelectRegiaoById", con); cmd.CommandType = CommandType.StoredProcedure; // Initialize parameters cmd.Parameters.AddWithValue("@CODIGO_REG", CodigoId); Regiao result = null; using (con) { con.Open(); SqlDataReader reader = cmd.ExecuteReader(); if (reader.Read()) result = new Regiao(reader); } return result; con.Close(); }   /// <summary> /// Delete a category /// </summary> [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Delete, true)] public static void DeleteRegiao(int CodigoId) { // Initialize command SqlConnection con = new SqlConnection(_connectionstring); SqlCommand cmd = new SqlCommand("DeleteRegiao", con); cmd.CommandType = CommandType.StoredProcedure; // Initialize parameters cmd.Parameters.AddWithValue("@CODIGO_REG", CodigoId); using (con) { con.Open(); cmd.ExecuteNonQuery(); } } } }     O problem esta quando clico no Botão Excluir do GRid,   recebo esta mensagem.       Server Error in '/Setri' Application. ObjectDataSource 'dsRegiao' could not find a non-generic method 'DeleteRegiao' that has parameters: CodigoId, CODIGO_REG.       Podem me ajuda?         A stored Procedure e a Conexão,   estão Funcionando e os nomes dos parametros estão corretos!