string sql1 = "SELECT DISTINCT Street, home, flat FROM BUILDS except SELECT DISTINCT Street, home, flat FROM allpeople";
using (SqlConnection connection1 = new SqlConnection(Form1.connect))
{
connection1.Open();
SqlDataAdapter adapter = new SqlDataAdapter(sql1, connection1);
DataTable dt = new DataTable();
adapter.Fill(dt);
DataSet ds = new DataSet();
ds.Tables.Add(dt);
MessageBox.Show(ds.Tables[0].TableName.ToString());
}