title: Saving and reading user setting in app.config
body: <p>I have this app.config :</p>
  
  <pre><code> &lt;?xml version="1.0"?&gt;
   &lt;configuration&gt;
   &lt;configSections&gt;
  &lt;sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" &gt;
    &lt;section name="Alvaro1.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" /&gt;
  &lt;/sectionGroup&gt;
  &lt;/configSections&gt;
  &lt;connectionStrings&gt;
  &lt;add name="conexx" connectionString="Data Source=192.168.1.2 ;Initial Catalog =ifdcontroladoria3 ;uid =sa;pwd = admin2012" providerName="System.Data.SqlClient" /&gt;
  &lt;/connectionStrings&gt;
  &lt;startup&gt;&lt;supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/&gt;&lt;/startup&gt;
  &lt;userSettings&gt;
  &lt;Alvaro1.Properties.Settings&gt;
     &lt;setting name="servidor" serializeAs="String"&gt;
      &lt;value /&gt;
    &lt;/setting&gt;
    &lt;setting name="banco" serializeAs="String"&gt;
      &lt;value /&gt;
    &lt;/setting&gt;
    &lt;setting name="user" serializeAs="String"&gt;
      &lt;value /&gt;
    &lt;/setting&gt;
    &lt;setting name="senha" serializeAs="String"&gt;
      &lt;value /&gt;
    &lt;/setting&gt;
  &lt;/Alvaro1.Properties.Settings&gt;
  &lt;/userSettings&gt;
  </code></pre>
  
  <p>I have set system.configuration in the header and in reference, and use this code to save values :</p>
  
  <pre><code>   Properties.Settings.Default.servidor = comboBox1.Text;
     Properties.Settings.Default.banco = cmbBancos.Text;
  </code></pre>
  
  <p>but when i try to read these values , nothing is saved :</p>
  
  <pre><code>        servidor = Properties.Settings.Default.servidor;
          banco = Properties.Settings.Default.banco;
          lblLevanta.Text = servidor + " " + banco;
  </code></pre>
  
  <p>What i m doing wrong</p>