does anyone konw why is this code giving an error saying:
There is already an open DataReader associated with this Command which must be closed first.
the error is coming form the place where i have cold the line

the code is below:

C# Syntax

public String[] LoadUSEmp()
        {
            String firstName;
            String lastName;
            int NoOfRows;
           

            db.openConnection();
            String query = @"Select FirstName,LastName From Employee Where Citizenship = 'US' Order by FirstName ";
            SqlCommand comm = new SqlCommand(query, DB.getConnection());
            SqlDataAdapter da1 = new SqlDataAdapter(comm);
            DataTable dt1 = new DataTable();

           [B] da1.Fill(dt1);[/B]

            NoOfRows = dt1.Rows.Count;
            String[] fullName = new String[NoOfRows];
            
            for (int i = 0; i < dt1.Rows.Count; i++)
            {
                firstName = dt1.Rows[i]["FirstName"].ToString();
                lastName = dt1.Rows[i]["LastName"].ToString();
                fullName[i] = firstName + " " + lastName;

            }
            comm.Dispose();
            db.closeConnection();
            return fullName;
        }

i need help thanxxxxxxxxxxx

add the following to your SqlConnection string

MultipleActiveResultSet=True

So it would look something Like this:

SqlConnection sqlCon = new SqlConnection(@"SQlSERVER\DB;Initial Catalog = myDB;MultipleActiveResultSet=True;User Id=finito;Password=pass123");

hey finito,
i have created the database connection in another class if i add this " MultipleActiveResultSet=True " errors comes in the places i have created instances from the DB connection class

typeInitialization Exception this was the error

Is this error being shown ion the SqlCon line?
All I asked you to do is let Sql get more than one Result on a single connection. I don't see the problem, Try and make a new connection on this page just to test and see if it works.

hello everybody, I have error with dataset. if anybody, plz send to me solution. thanks
my error da.Fill(ds, "dep"); error number :40
class1.cs

using System;
using System.Data.SqlClient;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    class Class1
    {
        public string constr="Server=(local)/SQLEXPRESS;DataBase=POS;Integrated Security=SSPI";
        public SqlConnection cnn = new SqlConnection("Server=(local)/SQLEXPRESS;DataBase=POS;Integrated Security=SSPI");
        //Data Source=LINLINPC\SQLEXPRESS;Initial Catalog=POS;Integrated Security=True

        public SqlCommand scm = new SqlCommand();
        public SqlCommand icmd = new SqlCommand();
        public SqlCommand ucmd = new SqlCommand();
        public SqlCommand dcmd = new SqlCommand();
        public SqlDataAdapter da = new SqlDataAdapter();
        public DataSet ds=new DataSet();            
        
        //public SqlConnection Cnn = new SqlConnection(ConfigurationException.["SSConstring"].ConnectionString.ToString());
        //public SqlDataAdapter da = new SqlDataAdapter(); 
        //cnn
        
    
        public Class1()
        {
                cnn.ConnectionString = constr;            
                scm = cnn.CreateCommand();
                da.SelectCommand = scm;
        }

    }


}


form1.cs

using System;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        Class1 gp = new Class1();
        SqlConnection con = new SqlConnection();
        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter();
        SqlCommand scmd = new SqlCommand();
        
       
        
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                con.ConnectionString = gp.constr;

                da.SelectCommand = scmd;
                scmd.Connection = con;             
               
                scmd.CommandText = "select *" + "from departmenttable";
                
                da.Fill(ds, "dep");

                dataGridView1.DataSource = ds.Tables["dep"];                
                dataGridView1.Columns[0].Visible = false;
                toolStripComboBox1.Items.Add("DepartmentID");
                toolStripComboBox1.SelectedIndex = 0;
            }
            catch (Exception ec)
            {

                MessageBox.Show("Connection Error" + ec.Message);
            }


        }
    }
}

Edited 6 Years Ago by __avd: Added [code] tags. For easy readability, always wrap programming code within posts in [code] (code blocks).

do u think this code is right

public string constr = "Server=LINLINPC/SQLEXPRESS;" + "DataBase=POS;" + "Integrated Security=SSPI";
public SqlConnection cnn = new SqlConnection();


or
public string constr = "Data Source=LINLINPC/SQLEXPRESS;Initial Catalog=POS;Integrated Security=True";
public SqlConnection cnn = new SqlConnection();
by using c#;

Edited 6 Years Ago by thanlin: n/a

public string constr = "Data Source=LINLINPC/SQLEXPRESS;Initial Catalog=POS;Integrated Security=True";
public SqlConnection cnn = new SqlConnection();

Where did u define SqlConnection

public SqlConnection cnn = new SqlConnection(constr);

as for your earlier question what is System.Linq ?which version are you using?

This article has been dead for over six months. Start a new discussion instead.