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

SqlCommand LoadSilk = new SqlCommand("SELECT silk_own FROM SK_Silk WHERE JID = (SELECT JID FROM TB_User WHERE StrUserID = '"+ comboBox1.Text +"')", Connection);
SqlDataReader SilkReader = LoadSilk.ExecuteReader();
SqlCommand LoadCharacter = new SqlCommand("SELECT * FROM SRO_VT_SHARD.DBO._Char WHERE CharID IN (SELECT CharID FROM SRO_VT_SHARD.DBO._User WHERE UserJID = "+ JID +")", Connection);
SqlDataReader CharacterReader = LoadCharacter.ExecuteReader();

try
{
    SilkReader.Read();
    textBox5.Text = SilkReader[0].ToString();
    Silk = SilkReader[0].ToString();
    dataGridView1.Enabled = true;
    button2.Enabled = true;
    while (CharacterReader.Read()) {
        dataGridView1.Rows.Add(CharacterReader["CharID"].ToString(), CharacterReader["CharName16"].ToString(), CharacterReader["CurLevel"].ToString());
    }
    log(comboBox1.Text + " account data loaded");
}
catch (Exception ex) {
    log(ex.Message);
    MessageBox.Show("Error");
} finally {
    SilkReader.Close();
    CharacterReader.Close();
}

and its gave me that error

There is already an open DataReader associated with this Command which must be closed first.

Solution 1

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.

Solution 2

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

Solution 3

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

Solution 4

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";

View more solutions