How to send mail in asp.net
<p>Hi
I have written code to send mail in asp.net as follows:</p>

<pre><code>        MailMessage mailMessage = new MailMessage();
        mailMessage.From = "xyz@gmail.com";
        mailMessage.To = "abc@gmail.com";
        mailMessage.Subject = "test";
        mailMessage.BodyFormat = MailFormat.Text;
        mailMessage.Body = "this is a test mail...";
        //mailMessage.Priority = MailPriority.High;
        SmtpMail.SmtpServer = "localhost";
        SmtpMail.Send(mailMessage);
        lblStatus.Text = "Your mail was sent";
</code></pre>

<p>and my web.config file is as follows</p>

<pre><code>&lt;?xml version="1.0"?&gt;
&lt;!-- 
    Note: As an alternative to hand editing this file you can use the 
    web admin tool to configure settings for your application. Use
    the Website-&gt;Asp.Net Configuration option in Visual Studio.
    A full list of settings and comments can be found in 
    machine.config.comments usually located in 
    \Windows\Microsoft.Net\Framework\v2.x\Config 
--&gt;
&lt;configuration&gt;
    &lt;configSections&gt;
        &lt;sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
            &lt;sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
                &lt;section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
                &lt;sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
                    &lt;section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/&gt;
                    &lt;section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
                    &lt;section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
                    &lt;section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
                &lt;/sectionGroup&gt;
            &lt;/sectionGroup&gt;
        &lt;/sectionGroup&gt;
    &lt;/configSections&gt;
  &lt;system.net&gt;
    &lt;mailsettings&gt;
      &lt;smtp deliverymethod="Network"&gt;
        &lt;network host="localhost" port="25" defaultcredentials="true" /&gt;
      &lt;/smtp&gt;
    &lt;/mailsettings&gt;
  &lt;/system.net&gt;


  &lt;appSettings&gt;
    &lt;add key="ConnectionString" value="server=W2K8SERVER;database=Quiz;uid=sa;pwd=Alpha#123"/&gt;
    &lt;add key="Delay" value="1800000"/&gt;
  &lt;/appSettings&gt;
  &lt;connectionStrings&gt;
    &lt;add name="QuizConnectionString" connectionString="Data Source=W2K8SERVER;Initial Catalog=Quiz;User ID=sa;Password=Alpha#123"
   providerName="System.Data.SqlClient" /&gt;
  &lt;/connectionStrings&gt;

    &lt;system.web&gt;
        &lt;!-- 
            Set compilation debug="true" to insert debugging 
            symbols into the compiled page. Because this 
            affects performance, set this value to true only 
            during development.
        --&gt;
        &lt;compilation debug="true"&gt;
            &lt;assemblies&gt;
                &lt;add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
                &lt;add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
                &lt;add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
                &lt;add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
            &lt;/assemblies&gt;
        &lt;/compilation&gt;
        &lt;!--
            The &lt;authentication&gt; section enables configuration 
            of the security authentication mode used by 
            ASP.NET to identify an incoming user. 
        --&gt;
        &lt;authentication mode="Windows"/&gt;
        &lt;!--
            The &lt;customErrors&gt; section enables configuration 
            of what to do if/when an unhandled error occurs 
            during the execution of a request. Specifically, 
            it enables developers to configure html error pages 
            to be displayed in place of a error stack trace.

        &lt;customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm"&gt;
            &lt;error statusCode="403" redirect="NoAccess.htm" /&gt;
            &lt;error statusCode="404" redirect="FileNotFound.htm" /&gt;
        &lt;/customErrors&gt;
        --&gt;
        &lt;pages&gt;
            &lt;controls&gt;
                &lt;add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
                &lt;add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
            &lt;/controls&gt;
        &lt;/pages&gt;
        &lt;httpHandlers&gt;
            &lt;remove verb="*" path="*.asmx"/&gt;
            &lt;add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
            &lt;add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
            &lt;add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/&gt;
        &lt;/httpHandlers&gt;
        &lt;httpModules&gt;
            &lt;add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;/httpModules&gt;
    &lt;/system.web&gt;
    &lt;system.codedom&gt;
        &lt;compilers&gt;
            &lt;compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt;
                &lt;providerOption name="CompilerVersion" value="v3.5"/&gt;
                &lt;providerOption name="WarnAsError" value="false"/&gt;
            &lt;/compiler&gt;
            &lt;compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" warningLevel="4" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt;
                &lt;providerOption name="CompilerVersion" value="v3.5"/&gt;
                &lt;providerOption name="OptionInfer" value="true"/&gt;
                &lt;providerOption name="WarnAsError" value="false"/&gt;
            &lt;/compiler&gt;
        &lt;/compilers&gt;
    &lt;/system.codedom&gt;
    &lt;!-- 
        The system.webServer section is required for running ASP.NET AJAX under Internet
        Information Services 7.0.  It is not necessary for previous version of IIS.
    --&gt;
    &lt;system.webServer&gt;
        &lt;validation validateIntegratedModeConfiguration="false"/&gt;
        &lt;modules&gt;
            &lt;remove name="ScriptModule"/&gt;
            &lt;add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;/modules&gt;
        &lt;handlers&gt;
            &lt;remove name="WebServiceHandlerFactory-Integrated"/&gt;
            &lt;remove name="ScriptHandlerFactory"/&gt;
            &lt;remove name="ScriptHandlerFactoryAppServices"/&gt;
            &lt;remove name="ScriptResource"/&gt;
            &lt;add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
            &lt;add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
            &lt;add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;/handlers&gt;
    &lt;/system.webServer&gt;
    &lt;runtime&gt;
        &lt;assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"&gt;
            &lt;dependentAssembly&gt;
                &lt;assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/&gt;
                &lt;bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/&gt;
            &lt;/dependentAssembly&gt;
            &lt;dependentAssembly&gt;
                &lt;assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/&gt;
                &lt;bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/&gt;
            &lt;/dependentAssembly&gt;
        &lt;/assemblyBinding&gt;
    &lt;/runtime&gt;

&lt;/configuration&gt;
</code></pre>

<p>But its giving error: Unrecognized configuration section System.net/mailsettings.
What should changes i do?
Asp.net c#
Thank you.</p>
