title: radiobuttons c# strange behaviour after submitting
body: <p>I have an strange behaviour with 2 radiobuttons.</p>
  
  <pre><code>&lt;asp:RadioButton  GroupName="grp_anexo" id="rdioAnexoSi"  runat="server" AutoPostBack="true" Checked="true" OnCheckedChanged="rdioAnexoSi_CheckedChanged" /&gt;SI
  
  &lt;asp:RadioButton   GroupName="grp_anexo" id="rdioAnexoNo"  runat="server" AutoPostBack="true" OnCheckedChanged="rdioAnexoNo_CheckedChanged" /&gt;NO 
  </code></pre>
  
  <p>i CHECKED "rdioAnexoSi", </p>
  
  <p>When click a button(submit), automatically select "rdioAnexoNo".</p>
  
  <p>why  radiobutton  is changing to "rdioAnexoNo" when i selected myself "rdioAnexoSi" after submitting? </p>
  
  <pre><code> $('#formIngreso').attr('action', "proceso.aspx").submit();
  
  
   protected void rdioAnexoNo_CheckedChanged(object sender, EventArgs e)
      {
          CheckBox chk = sender as CheckBox;
          if (chk != null)
          {
              if (chk.Checked)
              {
                  ddlAnexo.Items.Clear();
                  ddlAnexoN.Items.Clear();
                  div_anexo.Visible = false;
  
              }
              else
              {
                  div_anexo.Visible = true;
              }
  
          }
      }
  
  
   protected void rdioCelularSi_CheckedChanged(object sender, EventArgs e)
      {
          CheckBox chk = sender as CheckBox;
          if (chk != null)
          {
              if (chk.Checked)
              {
                  ddlCelular.Items.Clear();
                  sap sapserver = new sap();
                  sapserver.arr_parametros = sapserver.LecturaArchivo(300);
                  sapserver.rfc_config_conex = sapserver.SapParametros(sapserver.arr_parametros);
                  if (sapserver.probarConexionSap(sapserver.rfc_config_conex) == true)
                  {
                      RfcDestination RfcDestino = RfcDestinationManager.GetDestination(sapserver.rfc_config_conex);
                      sapserver.mostrarpep_cecos(RfcDestino, ddlCelular, ddlArea.SelectedValue.ToString().Trim());
  
                  }
                  else
                  {
  
                  }
  
                  div_celular.Visible = true;
              }
          }
  
  
  
  
      }
  </code></pre>