web configuration setting in asp.net web.config file

<configuration>
  <connectionStrings>
    <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <system.web>
    <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.Management, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
      </assemblies>
    </compilation>

    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login.aspx" timeout="2880"/>
    </authentication>
    <!--<membership>
            <providers>
                <clear/>
                <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/"/>
            </providers>
        </membership>
        <profile>
            <providers>
                <clear/>
                <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
            </providers>
        </profile>
        <roleManager enabled="false">
            <providers>
                <clear/>
                <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/"/>
                <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/"/>
            </providers>
        </roleManager>-->
    <customErrors mode="Off" defaultRedirect="~/GenericError_Message.aspx" />
    <pages>
      <controls>
        <add tagPrefix="cc2" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
        <add tagPrefix="cc1" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
        <add tagPrefix="asp" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
        <add tagPrefix="FTB" assembly="FreeTextBox" namespace="FreeTextBoxControls"/>
      </controls>
    </pages>
    <httpRuntime requestValidationMode = "2.0" />
    <siteMap enabled="true" defaultProvider="MyCustomSiteMap">
      <providers>
        <clear/>
        <add name="MyCustomSiteMap" type="MyCustomSiteMap"/>
      </providers>
    </siteMap>
    <!--<siteMap enabled="true" defaultProvider="MyCustomSiteMap">
      <providers>
        <clear/>
        <add name="MyCustomSiteMap" type="CustomSiteMap.MyCustomSiteMap"/>
      </providers>
    </siteMap>-->
    <globalization
     fileEncoding="utf-8"
     requestEncoding="utf-8"
     responseEncoding="utf-8"
     culture="en-US"
     uiCulture="de-DE"
    />
  
    <customErrors mode="RemoteOnly" defaultRedirect="ErrorPage.aspx">
      <error statusCode="522" redirect="Error522Page.aspx" />
      <error statusCode="404" redirect="ErrorPage.aspx" />
    </customErrors>
  
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
    <handlers>
      <add verb="GET" name="FTB"
                path="FtbWebResource.axd"
                type="FreeTextBoxControls.AssemblyResourceHandler, FreeTextBox" />
    </handlers>
    <defaultDocument>
      <files>
        <clear />
        <add value="Default.htm" />
        <add value="Default.asp" />
        <add value="index.htm" />
        <add value="index.html" />
        <add value="iisstart.htm" />
        <add value="default.aspx" />
        <add value="index.php" />
        <add value="index.aspx" />
      </files>
    </defaultDocument>
    <!-- Cross Domain Support but use when hosting on the production server not work on localhost -->
      <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Content-Type" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>
</configuration>