Read- Write Project Setting throw code ..in .net

Our connection string name and some of other settings mostly resides in our project setting files like app.config or web.config. 

In our code we want to grab this information from these setting files..there is bit a difference in VB.net and C# to access this infromation.

VB.NET

In vb.net we have My named namespace 

syntax for vb.net 

My.Settings.Item("Keyname") = "value to store" 

My.Settings.Save()

C#

In C# we have to use System.Configuration name space to access this information.

syntax for c#

System.Configuration.ConfigurationManager.AppSettings["KeyName"]  =  "value to store"

Here,In key name we can also use index of key.