changconnection string in web config at runtime

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ASP.NET

Hi All,

I have to connection string as below in web config
<add key="conn" value="server=abc\sqlexpress;database=abc; User ID=sa; Password=abc />

I have a web page in that I have 4 textboxes.
1 for server name,
2 for database name,
3 for User ID
4 for Password

and I have to do it at runtime.
Please let me know how to do it?

Thanking You
Mohd. Wasif