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OleDbCommand.ExecuteReader Method ()

Sends the CommandText to the Connection and builds an OleDbDataReader.

Namespace: System.Data.OleDb
Assembly: System.Data (in system.data.dll)

public OleDbDataReader ExecuteReader ()
public OleDbDataReader ExecuteReader ()
public function ExecuteReader () : OleDbDataReader

Return Value

An OleDbDataReader object.

Exception typeCondition

InvalidOperationException

Cannot execute a command within a transaction context that differs from the context in which the connection was originally enlisted.

When the CommandType property is set to StoredProcedure, the CommandText property should be set to the name of the stored procedure. The command executes this stored procedure when you call ExecuteReader.

While the OleDbDataReader is being used, the associated OleDbConnection is busy serving the OleDbDataReader. While in this state, no other operations can be performed on the OleDbConnection other than closing it. This is the case until the Close method of the OleDbDataReader is called.

The following example creates an OleDbCommand, and then executes it by passing a string that is an SQL SELECT statement, and a string to use to connect to the data source.

public void CreateReader(string connectionString, string queryString)
{
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);
        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();

        while (reader.Read())
        {
            Console.WriteLine(reader[0].ToString());
        
        reader.Close();
    

using System;
using System.Data;
using System.Data.OleDb;

class Class1
{
    static void Main()
    {
    

    public void CreateReader(string connectionString, string queryString)
    {
        using (OleDbConnection connection = new OleDbConnection(connectionString))
        {
            OleDbCommand command = new OleDbCommand(queryString, connection);
            connection.Open();
            OleDbDataReader reader = command.ExecuteReader();

            while (reader.Read())
            {
                Console.WriteLine(reader[0].ToString());
            
            reader.Close();
        

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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