Modify the web.config's value at runtime

This code snippets will describe the way with which we can change the value of key present in the appsetting section of the web.config.

Suppose you have a key named Price as:

<add key="Price" value="5" />

and you want to change this value dynamically.

Code to Change the above Value:
Namespace needs to added for this:

using System.Configuration;
using System.Web.Configuration;

Configuration myconf = WebConfigurationManager.OpenWebConfiguration("~");
        myconf.AppSettings.Settings["Price"].Value = txtPrice.Text.Trim();
        myconf.Save();

In the above code txtPrice.Text contains the new value for price.

Thanks & Regards
Lakhan Pal Garg