accessing mssql database from a different computer

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C#

SQL

i have installed mssql database on my laptop and i have created a c# application
that stores and retrieve data into the database. this is working normally, i try creating a peer to peer network and installed the c# application on the second computer and try accessing the sql database on the first laptop but was not able to access it. please can any one help me out with the configuration.

this is the connection string used

SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
            conn.ConnectionString = "Data Source=USER-PC;Initial Catalog=CENTRALDB;User ID=sa;Password=mike";
            conn.Open();