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OleDbDataReader.GetOrdinal Method

Gets the column ordinal, given the name of the column.

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

public override int GetOrdinal (
	string name
)
public int GetOrdinal (
	String name
)
public override function GetOrdinal (
	name : String
) : int

Parameters

name

The name of the column.

Return Value

The zero-based column ordinal.

Exception typeCondition

IndexOutOfRangeException

The name specified is not a valid column name.

GetOrdinal performs a case-sensitive lookup first. If it fails, a second case-insensitive search is made.

GetOrdinal is kana-width insensitive.

Because ordinal-based lookups are more efficient than named lookups, it is inefficient to call GetOrdinal within a loop. Save time by calling GetOrdinal one time and assigning the results to an integer variable for use within the loop.

The following example demonstrates how to use the GetOrdinal method.

public static void ReadData(string connectionString)
{
    string queryString = "SELECT DISTINCT CustomerID FROM Orders";
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);

        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();

        int customerID = reader.GetOrdinal("CustomerID");

        while (reader.Read())
        {
            Console.WriteLine("CustomerID={0", reader.GetString(customerID));
        
        reader.Close();
    


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

class Class1
{
    static void Main()
    {
        string x = "Provider=SQLOLEDB;Data Source=(local);Integrated Security=SSPI;Initial Catalog=Northwind";
        ReadData(x);
    

    public static void ReadData(string connectionString)
    {
        string queryString = "SELECT DISTINCT CustomerID FROM Orders";
        using (OleDbConnection connection = new OleDbConnection(connectionString))
        {
            OleDbCommand command = new OleDbCommand(queryString, connection);

            connection.Open();
            OleDbDataReader reader = command.ExecuteReader();

            int customerID = reader.GetOrdinal("CustomerID");

            while (reader.Read())
            {
                Console.WriteLine("CustomerID={0", reader.GetString(customerID));
            
            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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