DataColumnCollection Class

Represents a collection of DataColumn objects for a DataTable.

Namespace: System.Data
Assembly: System.Data (in

Public NotInheritable Class DataColumnCollection
	Inherits InternalDataCollectionBase
Dim instance As DataColumnCollection

public final class DataColumnCollection extends InternalDataCollectionBase
public final class DataColumnCollection extends InternalDataCollectionBase

The DataColumnCollection defines the schema of a DataTable, and determines what kind of data each DataColumn can contain. You can access the DataColumnCollection through the Columns property of the DataTable object.

The DataColumnCollection uses the Add and Remove methods to insert and delete DataColumn objects. Use the Count property to determine how many DataColumn objects are in the collection. Use the Contains method to verify whether a specified index or column name exists in the collection.

The following example iterates through a collection of DataColumn objects and prints various properties of each column in the collection.

Private Sub PrintDataTableColumnInfo(table As DataTable)
    ' Use a DataTable object's DataColumnCollection.
    Dim columns As DataColumnCollection = table.Columns

    ' Print the ColumnName and DataType for each column.
    Dim column As DataColumn
    For Each column in columns
End Sub


This type is safe for multithreaded read operations. You must synchronize any write operations.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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

.NET Compact Framework

Supported in: 2.0, 1.0

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