Web Form Update is not showing text values in dropdownlists and It is not updating also

My web applicatin has three web forms using Master Page that access data tables in SqlServer database:

1 - Autoridade.aspx that shows data and search

2 - Autoridade_Add.aspx that inserts data in table lideranca

3- Autoridade_Atualizar.aspx that updates data in table lideranca

Autoridade.aspx has a GridView that show data and uses asp:HyperLinkField to redirect to Autoridade_Atualizar.aspx:

<asp:Panel runat="server" ID="pnlShowData" Visible="true">
    <h1>Todas as Autoridades Cadastradas</h1>
    <asp:GridView ID="gwDados" runat="server" AutoGenerateColumns="False" EmptyDataText="Não Existem Autoridades Cadastradas...">
        <Columns>
            <asp:BoundField DataField="id" HeaderText="ID" />
            <asp:BoundField DataField="nome" HeaderText="Nome" />
            <asp:BoundField DataField="partido" HeaderText="Partido" />
            <asp:BoundField DataField="aliado" HeaderText="Aliado" />
            <asp:BoundField DataField="cargo" HeaderText="Cargo" />
            <asp:BoundField DataField="lotacao" HeaderText="Lotação" />
            <asp:BoundField DataField="atuacao" HeaderText="Atuação" />
            <asp:HyperLinkField DataNavigateUrlFormatString="Autoridade_Atualizar.aspx?id={0}" Text="Editar" DataNavigateUrlFields="id" />
        </Columns>
    </asp:GridView>
</asp:Panel>

<asp:Panel runat="server" ID="pnlSearch" Visible="true">
      <ul>
        <li>
            <asp:Label Text="Nome" ID="label9" runat="server"></asp:Label>
            <asp:TextBox ID="tbPesqNome" Text="" CssClass="radiusInput" runat="server"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="Cargo" runat="server" Text="Cargo"></asp:Label>
            <asp:DropDownList ID="ddlcargo" DataTextField="carg_cargo" DataValueField="carg_cd_cargo" CssClass="radiusInput" runat="server" Width="454px"></asp:DropDownList>
        </li>
        <li>
            <asp:Label ID="Partido" runat="server" Text="Partido"></asp:Label>
            <asp:DropDownList ID="ddlpartido" DataTextField="part_sigla" DataValueField="part_cd_partido" CssClass="radiusInput" runat="server" Width="254px"></asp:DropDownList>
        </li>
        <li>
            <asp:Label ID="Municipio" runat="server" Text="Município Atuação"></asp:Label>
            <asp:DropDownList ID="ddlmunicipio" DataTextField="municipios" DataValueField="id_municipios" CssClass="radiusInput" runat="server" Width="454px"></asp:DropDownList>
        </li>
        <li> 
            <asp:Label ID="Base" runat="server" Text="Base Aliada"></asp:Label>
            <asp:DropDownList ID="ddlbasealiada" DataTextField="bas_base" DataValueField="bas_cd_base" CssClass="radiusInput" runat="server" Width="154px"></asp:DropDownList>
        </li>
        <li>
            <asp:Label ID="Orgao" runat="server" Text="Orgão de Lotação"></asp:Label>
            <asp:DropDownList ID="ddlorgao" DataTextField="orgao" DataValueField="codorgao" CssClass="radiusInput" runat="server" Width="454px"></asp:DropDownList>
        </li> 
        <li>
            <asp:Button ID="btnSearch" CssClass="btn btnSearch" runat="server" Text="Pesquisar" />
        </li>
    </ul>
</asp:Panel>

The first problem occurs here when I click on hyperlink the data are showed in web form Autoridade_Atualizar.aspx but the datafields (Cargo,Partido,Municipio,Base,Orgao) that use DropDownList control in this web form show integer values instead text values:

<asp:Panel runat="server" ID="pnlUpdate" Visible="true">
    <h1>Atualizar Autoridade</h1>
    <ul>
        <li>
            <asp:Label ID="CodAutoridade" runat="server" Text="Cód. Autoridade"></asp:Label>
            <asp:TextBox ID="tbCodAutoridade" Text="2013" Enabled="false" CssClass="radiusInput disable" runat="server" Width="546px"></asp:TextBox>
        </li>
        <li>
            <asp:Label Text="Nome" ID="label1" runat="server" Width="88px"></asp:Label>
            <asp:TextBox ID="tbNome" Text="" CssClass="radiusInput" runat="server" Width="654px" Height="16px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="Cargo" runat="server" Text="Cargo"></asp:Label>
            <asp:DropDownList ID="ddlcargo" DataTextField="carg_cargo" DataValueField="carg_cd_cargo" CssClass="radiusInput" runat="server" Width="454px"></asp:DropDownList>
        </li>
        <li>
            <asp:Label ID="Partido" runat="server" Text="Partido"></asp:Label>
            <asp:DropDownList ID="ddlpartido" DataTextField="part_sigla" DataValueField="part_cd_partido" CssClass="radiusInput" runat="server" Width="254px"></asp:DropDownList>
        </li>
        <li>
            <asp:Label ID="Descricao" runat="server" Text="Descrição"></asp:Label>
            <asp:TextBox ID="tbDescricao" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="Email" runat="server" Text="Email"></asp:Label>
            <asp:TextBox ID="tbemail" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="Facebook" runat="server" Text="Facebook"></asp:Label>
            <asp:TextBox ID="tbfacebook" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="Twitter" runat="server" Text="Twitter"></asp:Label>
            <asp:TextBox ID="tbtwitter" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="EndComercial" runat="server" Text="Endereço Comercial"></asp:Label>
            <asp:TextBox ID="tbendercomercial" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="EndResidencial" runat="server" Text="Endereço Residencial"></asp:Label>
            <asp:TextBox ID="tbenderesidencial" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="TelCelular" runat="server" Text="Telefone Celular"></asp:Label>
            <asp:TextBox ID="tbfonecelular" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="TelResidencial" runat="server" Text="Telefone Residencial"></asp:Label>
            <asp:TextBox ID="tbfoneresidencial" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="TelComercial" runat="server" Text="Telefone Comercial"></asp:Label>
            <asp:TextBox ID="tbfonecomercial" runat="server" CssClass="radiusInput" Width="651px"></asp:TextBox>
        </li>
        <li>
            <asp:Label ID="Municipio" runat="server" Text="Município Atuação"></asp:Label>
            <asp:DropDownList ID="ddlmunicipio" DataTextField="municipios" DataValueField="id_municipios" CssClass="radiusInput" runat="server" Width="454px"></asp:DropDownList>
        </li>
        <li> 
            <asp:Label ID="Base" runat="server" Text="Base Aliada"></asp:Label>
            <asp:DropDownList ID="ddlbasealiada" DataTextField="bas_base" DataValueField="bas_cd_base" CssClass="radiusInput" runat="server" Width="154px"></asp:DropDownList>
        </li>
        <li>
            <asp:Label ID="Orgao" runat="server" Text="Orgão de Lotação"></asp:Label>
            <asp:DropDownList ID="ddlorgao" DataTextField="orgao" DataValueField="codorgao" CssClass="radiusInput" runat="server" Width="454px"></asp:DropDownList>
        </li> 
        <li>
        <li>
            <asp:Button ID="bntAtualizar" CssClass="btn btnEdit" runat="server" Text="Atualizar" OnClick="bntAtualizar_Click"/>
        </li>
    </ul>
</asp:Panel>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using Model;

namespace SchoolSystem
{
    public partial class Autoridade_Atualizar : System.Web.UI.Page
    {
        private ModelDataContext mdc;

        protected void Page_Load(object sender, EventArgs e)
        {
            PopulateCargo();
            PopulatePartido();
            PopulateMunicipio();
            PopulateBase();
            PopulateOrgao();


            if (!IsPostBack)
            {

                try
                {
                    this.PopulateFields(int.Parse(Request.QueryString["id"]));
                }
                catch (Exception)
                {

                    this.PopulateFields();
                }
            }


        }


        public void PopulateCargo()
        {
            if (!IsPostBack)
            {

                string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
                using (SqlConnection con = new SqlConnection(CS))
                {
                    SqlCommand cmd = new SqlCommand("SELECT carg_cargo,carg_cd_cargo FROM lid_cargo", con);
                    con.Open();
                    ddlcargo.DataSource = cmd.ExecuteReader();
                    ddlcargo.DataBind();

                }
            }

        }

        public void PopulatePartido()
        {
            if (!IsPostBack)
            {
                string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
                using (SqlConnection con = new SqlConnection(CS))
                {
                    SqlCommand cmd = new SqlCommand("SELECT part_sigla,part_cd_partido FROM lid_partido", con);
                    con.Open();
                    ddlpartido.DataSource = cmd.ExecuteReader();
                    ddlpartido.DataBind();
                }
            }

        }

        public void PopulateMunicipio()
        {
            if (!IsPostBack)
            {
                string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
                using (SqlConnection con = new SqlConnection(CS))
                {
                    SqlCommand cmd = new SqlCommand("SELECT municipios,id_municipios FROM redat_municipio", con);
                    con.Open();
                    ddlmunicipio.DataSource = cmd.ExecuteReader();
                    ddlmunicipio.DataBind();
                }
            }
        }

        public void PopulateBase()
        {
            if (!IsPostBack)
            {
                string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
                using (SqlConnection con = new SqlConnection(CS))
                {
                    SqlCommand cmd = new SqlCommand("SELECT bas_base,bas_cd_base FROM lid_base", con);
                    con.Open();
                    ddlbasealiada.DataSource = cmd.ExecuteReader();
                    ddlbasealiada.DataBind();
                }
            }
        }

        public void PopulateOrgao()
        {
            if (!IsPostBack)
            {
                string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
                using (SqlConnection con = new SqlConnection(CS))
                {
                    SqlCommand cmd = new SqlCommand("SELECT orgao,codorgao FROM redat_orgaos", con);
                    con.Open();
                    ddlorgao.DataSource = cmd.ExecuteReader();
                    ddlorgao.DataBind();
                }
            }
        }

        protected void bntAtualizar_Click(object sender, EventArgs e)
        {
            this.OnUpdate();
        }

        private void OnUpdate()
        {

            mdc = new ModelDataContext();
            try
            {
                  lid_lideranca lideranca = mdc.lid_liderancas.First(aut => aut.lid_cd_lideranca == int.Parse(tbCodAutoridade.Text.Trim()));


                    tbNome.Text = lideranca.lid_nome;
                    ddlcargo.SelectedItem.Text = lideranca.lid_cargo.ToString();
                    ddlpartido.SelectedItem.Text = lideranca.lid_cd_partido.ToString();
                    tbDescricao.Text = lideranca.lid_cargo2;
                    tbemail.Text = lideranca.lid_email;
                    tbfacebook.Text = lideranca.lid_facebook;
                    tbtwitter.Text = lideranca.lid_twitter; 
                    tbendercomercial.Text = lideranca.lid_endereco_comercial;
                    tbenderesidencial.Text = lideranca.lid_endereco_residencial;
                    tbfonecelular.Text = lideranca.lid_fone_celular;
                    tbfoneresidencial.Text = lideranca.lid_fone_residencial;
                    tbfonecomercial.Text = lideranca.lid_fone_comercial;
                    ddlmunicipio.SelectedItem.Text = lideranca.lid_cd_cidade_atuacao.ToString();
                    ddlbasealiada.SelectedItem.Text = lideranca.lid_cd_base_aliada.ToString();
                    ddlorgao.SelectedItem.Text = lideranca.lid_cd_orgao.ToString();


                    mdc.SubmitChanges();

                    Response.Redirect("Autoridade.aspx");               
            }
            catch (Exception)
            {

            }
            finally
            {
                mdc.Dispose();
            }

        }

        private void PopulateFields(int pGetID = 0)
        {
            mdc = new ModelDataContext();
            try
            {
                if (pGetID > 0)
                {
                    lid_lideranca lideranca = mdc.lid_liderancas.First(aut => aut.lid_cd_lideranca == pGetID);


                    tbCodAutoridade.Text = pGetID.ToString();
                    tbNome.Text = lideranca.lid_nome;
                    ddlcargo.SelectedItem.Text = lideranca.lid_cargo.ToString();
                    ddlpartido.SelectedItem.Text = lideranca.lid_cd_partido.ToString();
                    tbDescricao.Text = lideranca.lid_cargo2;
                    tbemail.Text = lideranca.lid_email;
                    tbfacebook.Text = lideranca.lid_facebook;
                    tbtwitter.Text = lideranca.lid_twitter;
                    tbendercomercial.Text = lideranca.lid_endereco_comercial;
                    tbenderesidencial.Text = lideranca.lid_endereco_residencial;
                    tbfonecelular.Text = lideranca.lid_fone_celular;
                    tbfoneresidencial.Text = lideranca.lid_fone_residencial;
                    tbfonecomercial.Text = lideranca.lid_fone_comercial;
                    ddlmunicipio.SelectedItem.Text = lideranca.lid_cd_cidade_atuacao.ToString();
                    ddlbasealiada.SelectedItem.Text = lideranca.lid_cd_base_aliada.ToString();
                    ddlorgao.SelectedItem.Text = lideranca.lid_cd_orgao.ToString();


                }
                else
                {
                    Response.Redirect("Autoridade.aspx");
                }
            }
            catch (Exception)
            {

            }
            finally
            {
                mdc.Dispose();
            }
        }
    }
}

The DropDownLists show text values in tables lid_cargo, lid_partido, redat_municipio, lid_base and redat_orgaos. Where I am missing? Maybe my implementation in Autoridade_Atualizar.aspx.cs is forgetting something.