How to change a connection string a one database to another database by user login

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ASP.NET

Hi....


Good evening...

I have develop a website in asp.net 3.5.I want to change the connection string in dynamic by user selection financial year one Database to Another database.I have use web.config for Default database.

<appSettings>
        <add key="conInfo" value="Data Source=SERVER;Initial Catalog=Tryal_DB;User Id=sa;Password=dev12345"/>
    </appSettings>

and use a code

public class ConnectionInfo
    {
        public static string info
        {
            get
            {
                return ConfigurationSettings.AppSettings["conInfo"];
            }
        }
   }

How to change a connection string a one database to another database by user login.
Please help me.

Thank You,
Debapriya