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Reference link: &nbsp;<a href="https://msdn.microsoft.com/en-us/library/bb763179(v=vs.100).aspx" rel="ugc">https://msdn.microsoft.com/en-us/library/bb763179(v=vs.100).aspx</a><br />
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Dan
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Reference link:  https://msdn.microsoft.com/en-us/library/bb763179(v=vs.100).aspx [https://msdn.microsoft.com/en-us/library/bb763179(v=vs.100).aspx]

Dan

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I am receiving following errors In &nbsp;web.config file &nbsp;using VS2010 &nbsp;(.net framework 4.0)<br />
1.Unrecognized configuration section system.web/add <br />
2. The element 'system.web' has invalid child element 'defaultDocument'<br />

<pre><code id="code-10-28738148-1">&lt;add tagPrefix=&quot;asp&quot; namespace=&quot;System.Web.UI&quot; assembly=&quot;System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=75BF384334AD364E35&quot;/&gt;</code></pre>
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I am receiving following errors In  web.config file  using VS2010  (.net framework 4.0)
1.Unrecognized configuration section system.web/add 
2. The element 'system.web' has invalid child element 'defaultDocument'
(CODE)

Unrecognized configuration section  in Asp.net

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.