How to establish a common database connection in web.config

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<configuration>
<!--application specific settings-->
<appSettings>
<add key= "ConnectionString" value= "server=localhost;uid=sa;pwd=;d atabase=store"/>
</appSettings>
<configuration>

Public SqlDataReader getreviews (int productID) {

Creating connection and Command object instances
SqlConnection myconnection = new SqlConnection (configurationsettings.appsettings["ConnectionString"]);
SqlCommand mycommand = new SqlCommand ("Reviewslist", MyConnection);

myCommand.CommandType = CommandType.StoredProcedure;

Parameters
SqlParameter Parameterproductid = new SqlParameter ("@ProductID", SqlDbType.Int, 4);
Parameterproductid.value = ProductID;
MYCOMMAND.PARAMETERS.ADD (Parameterproductid);

Perform
Myconnection.open ();
SqlDataReader result = Mycommand.executereader (commandbehavior.closeconnection);

return results
return result;
}