Runtime DB connection fra winapp

Kode 

public class Database
{
  private string ConnString = string.Empty;
	
  public Database(string Source, string DatabaseNavn){
    StringBuilder db = new StringBuilder();
    db.Append("Data Source=");
    db.Append(Source??System.Environment.MachineName.ToString());
    db.Append("\\\\SQLEXPRESS;");
    db.Append("Initial Catalog=");
    db.Append(DatabaseNavn??"dbo"+";");
    db.Append("Integrated Security=True");
    ConnString = db.ToString() );
  }
  
  public DataSet hentData(){
    DataSet ds = new DataSet();
    using (SqlConnection conn = new SqlConnection connnString)) 
  {
    using (SqlCommand cmd = new SqlCommand("SELECT * FROM TABEL", conn))  {
      SqlDataAdapter da = new SqlDataAdapter(cmd);
      da.Fill(ds, "enTabel");
      } 
    }
    return ds;
  }