How to create a DLL file in ASP.NET 4.0?

Please tell me how to create a DLL file in 4.0

This is my code. Please tell me if there is any problem with this code.

namespace databaselogic

public class mycomponent
public DataSet getdata(string sql1)
SqlConnection con = new SqlConnection("datasource=.\\sqlexpress;attachdbfile=e:\\aspnet\\databaselogic2\\app_data\\peers.mdf;integrated security=true;user instance=true");
SqlDataAdapter da = new SqlDataAdapter(sql1, con);
DataSet ds=new DataSet ();
da.Fill (ds,"d");
return (ds);


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