Creating Custom errors in web.config ASP.NET C# (error page in asp.net)

 Add the below section in web.config:-

<system.web>

<customErrors mode="On" defaultRedirect="Error501.aspx">

      <error redirect="Error404.aspx" statusCode="404" />

      <error redirect="Error501.aspx" statusCode="400" />

      <error redirect="Error402.aspx" statusCode="402" />

      <error redirect="Error501.aspx" statusCode="500" />

      <error redirect="Error501.aspx" statusCode="501" />

    </customErrors>

</system.web>