Question

I have to find max value of one table using dataset.
I have written code for that as follows :

    DataSet ds = new DataSet();
    SqlDataAdapter da = new SqlDataAdapter("select max(FlightBookingID) from dbo.FlightBookingDetails", FlyCon);
    da.Fill(ds);
    if (ds != null)
    {
      Session["FBookingID"] = Convert.ToString(ds.Tables[0].Rows[0]["FlightBookingID"]);
    }

But its geting error in

Convert.ToString(ds.Tables[0].Rows[0]["FlightBookingID"]);

What changes should i do in above code?

Answer 1

Why can’t you use SqlCommand.ExecuteScalar?

using (SqlCommand comm = new SqlCommand("select max(FlightBookingID) from dbo.FlightBookingDetails", FlyCon))
{
    var result = comm.ExecuteScalar();
    if (!Convert.IsDBNull(result))
        Session["FBookingID"] = result;
}

DataSet is very complex class, and you shouldn’t create it just to get one value from the database.