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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 Overrides Function GetOrdinal ( _
	name As String _
) As Integer
Dim instance As OleDbDataReader 
Dim name As String 
Dim returnValue As Integer 

returnValue = instance.GetOrdinal(name)


Type: System.String

The name of the column.

Return Value

Type: System.Int32
The zero-based column ordinal.




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. The method throws an IndexOutOfRange exception if the zero-based column ordinal is not found.

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 Sub ReadData(ByVal connectionString As String)
    Dim queryString As String = "SELECT DISTINCT CustomerID FROM Orders" 

    Using connection As New OleDbConnection(connectionString)
        Dim command As New OleDbCommand(queryString, connection)


        Dim reader As OleDbDataReader = command.ExecuteReader()

        Dim customerID As Integer = reader.GetOrdinal("CustomerID")
        While reader.Read()
            Console.WriteLine("CustomerID={0}", reader.GetString(customerID))
        End While
    End Using 
End Sub

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0