where 2 write conectionstrng in case of 3 projects one is ASp.NET app(front end)second is ASP.NET webservice app(buisines layer),third is classlibraryproject(DataAcess) how shud i write...

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ASP.NET

can i write my connectionstring in the web.config file of my asp.net application and use it in the class library where am writing my dataacces methods.. if possible then how let me know
public bool SaveData(StringBuilder sb)
{
string query = sb.ToString();
bool flag = false;
string strConnection;
strConnection = ConfigurationSettings.AppSettings["dbtest"].ToString();
SqlConnection con = new SqlConnection(strConnection);
con.Open();
SqlCommand cmd = new SqlCommand(query, con);
try
{

int i = cmd.ExecuteNonQuery();
if (i > 0)
{
flag = true;

}
else
{
flag = false;
}
}
catch (Exception e)
{
string error = e.Message;
}
finally
{
con.Close();
}
return flag;
}