C# Using 2 sqldatareader at same time?

Question

Hello is there a way to use two sqldatareader at same time ?

i was coding a program

and i got error because i use 2 readers at same

Sample of code

Answer 1

It is possible when you use something called Multiple Active Result Sets, or MARS. Check out this helpful article that details all possible pitfalls.

Answer 2

1.Just add MultipleActiveResultSets=True into your connection string:

private string _ConnectionString = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=yourdbpath\Database.mdf;Integrated Security=True;MultipleActiveResultSets=True;Connect Timeout=30";

Answer 3

Declare those DataReader in the block public partial class Form1 : Form Example:

namespace GoodFood_1_
{
    public partial class Autentificare_client : Form
   {
        SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\edi_b\Documents\visual studio 2013\Projects\GoodFood(1)\GoodFood(1)\GOOD_FOOD.mdf;
        Integrated Security=True;MultipleActiveResultSets=True");
        SqlConnection con2 = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=c:\users\edi_b\documents\visual studio 2013\Projects\GoodFood(1)\GoodFood(1)\GOOD_FOOD.mdf;
        Integrated Security=True;MultipleActiveResultSets=True");

        SqlDataReader dr;
        SqlDataReader cc;

        public Autentificare_client()
        {
            InitializeComponent();
        }

Answer 4

The error message is misleading. You must have MultipleActiveResultSets=True set in your connection string to be able to send two seperate commands with two different readers.

Answer 5

You'll have to enable Multiple Active Recordsets (MARS) on your connection.

http://msdn.microsoft.com/en-us/library/h32h3abf%28v=vs.80%29.aspx