Adding custom tags in app.config

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C#

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Hi
I have to add a configuration tag in app.config, how can i access the tag values in C#.I have already googled and got some solutions. I tried that and got the below error

"Only one <configsections> element allowed per config file and if present must be the first child of the root

<configuration>

element."

My App.Config is

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
  <configSections>
    <section name="Category" type="Hang.MyConfigSection" />

  </configSections>

  <Category>
    <add name="Animals" FilePath="Animals.txt" />
    <add name="Cities" FilePath="Cities.txt" />
  </Category>
</configuration>

and C# Code is

public class MyConfigSection : ConfigurationSection
   {
       [ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)]
       public MyConfigInstanceCollection Instances
       {
           get { return (MyConfigInstanceCollection)this[""]; }
           set { this[""] = value; }
       }
   }

   public class MyConfigInstanceCollection : ConfigurationElementCollection
   {
       protected override ConfigurationElement CreateNewElement()
       {
           return new MyConfigInstanceElement();
       }

       protected override object GetElementKey(ConfigurationElement element)
       {
           //set to whatever Element Property you want to use for a key
           return ((MyConfigInstanceElement)element).Name;
       }
   }

   public class MyConfigInstanceElement : ConfigurationElement
   {
       //Make sure to set IsKey=true for property exposed as the GetElementKey above
       [ConfigurationProperty("name", IsKey = true, IsRequired = true)]
       public string Name
       {
           get { return (string)base["name"]; }
           set { base["name"] = value; }
       }

       [ConfigurationProperty("FilePath", IsRequired = true)]
       public string Code
       {
           get { return (string)base["FilePath"]; }
           set { base["FilePath"] = value; }
       }
   }

and calling by

var config = ConfigurationManager.GetSection("Category")
                 as MyConfigSection;

Where am i missing?...


Thanks All.