DataColumnCollection Class
Assembly: System.Data (in system.data.dll)
'Declaration Public NotInheritable Class DataColumnCollection Inherits InternalDataCollectionBase 'Usage Dim instance As DataColumnCollection
public final class DataColumnCollection extends InternalDataCollectionBase
public final class DataColumnCollection extends InternalDataCollectionBase
Not applicable.
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 Console.WriteLine(column.ColumnName) Console.WriteLine(column.DataType.ToString) Next End Sub
Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.