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DataView.ToTable Method (String)

Creates and returns a new DataTable based on rows in an existing DataView.

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

'Declaration
Public Function ToTable ( _
	tableName As String _
) As DataTable
'Usage
Dim instance As DataView 
Dim tableName As String 
Dim returnValue As DataTable 

returnValue = instance.ToTable(tableName)

Parameters

tableName
Type: System.String

The name of the returned DataTable.

Return Value

Type: System.Data.DataTable
A new DataTable instance that contains the requested rows and columns.

Because this method does not let you specify a subset of available columns, the output table contains the same columns as the input table.

The following console application example creates a DataTable, fills the DataTable with data, creates a filtered view based on the original data, and finally creates a DataTable with a new name that contains the filtered rows.

Private Sub DemonstrateDataView()
    ' Create a DataTable with three columns. 
    Dim table As DataTable = New DataTable("NewTable")
    Console.WriteLine("Original table name: " & table.TableName)
    Dim column As DataColumn = New DataColumn("ID", GetType(System.Int32))
    table.Columns.Add(column)

    column = New DataColumn("Category", GetType(System.String))
    table.Columns.Add(column)

    column = New DataColumn("Product", GetType(System.String))
    table.Columns.Add(column)

    column = New DataColumn("QuantityInStock", GetType(System.Int32))
    table.Columns.Add(column)


    ' Add some items. 
    Dim row As DataRow = table.NewRow()
    row.ItemArray = New Object() {1, "Fruit", "Apple", 14}
    table.Rows.Add(row)

    row = table.NewRow()
    row.ItemArray = New Object() {2, "Fruit", "Orange", 27}
    table.Rows.Add(row)

    row = table.NewRow()
    row.ItemArray = New Object() {3, "Bread", "Muffin", 23}
    table.Rows.Add(row)

    row = table.NewRow()
    row.ItemArray = New Object() {4, "Fish", "Salmon", 12}
    table.Rows.Add(row)

    ' Mark all rows as "accepted". Not required 
    ' for this particular example.
    table.AcceptChanges()

    ' Print current table values.
    PrintTableOrView(table, "Current Values in Table")

    Dim view As DataView = New DataView(table)
    view.RowFilter = "QuantityInStock > 15"
    PrintTableOrView(view, "Current Values in View")

    Dim newTable As DataTable = view.ToTable("FilteredTable")
    PrintTableOrView(newTable, "Table created from filtered DataView")
    Console.WriteLine("New table name: " & newTable.TableName)

    Console.WriteLine("Press any key to continue.")
    Console.ReadKey()
End Sub 

Private Sub PrintTableOrView(ByVal dv As DataView, ByVal label As String)
    Dim sw As System.IO.StringWriter
    Dim output As String 
    Dim table As DataTable = dv.Table

    Console.WriteLine(label)

    ' Loop through each row in the view. 
    For Each rowView As DataRowView In dv
        sw = New System.IO.StringWriter

        ' Loop through each column. 
        For Each col As DataColumn In table.Columns
            ' Output the value of each column's data.
            sw.Write(rowView(col.ColumnName).ToString() & ", ")
        Next
        output = sw.ToString
        ' Trim off the trailing ", ", so the output looks correct. 
        If output.Length > 2 Then
            output = output.Substring(0, output.Length - 2)
        End If 
        ' Display the row in the console window.
        Console.WriteLine(output)
    Next
    Console.WriteLine()
End Sub 

Private Sub PrintTableOrView(ByVal table As DataTable, ByVal label As String)
    Dim sw As System.IO.StringWriter
    Dim output As String

    Console.WriteLine(label)

    ' Loop through each row in the table. 
    For Each row As DataRow In table.Rows
        sw = New System.IO.StringWriter
        ' Loop through each column. 
        For Each col As DataColumn In table.Columns
            ' Output the value of each column's data.
            sw.Write(row(col).ToString() & ", ")
        Next
        output = sw.ToString
        ' Trim off the trailing ", ", so the output looks correct. 
        If output.Length > 2 Then
            output = output.Substring(0, output.Length - 2)
        End If 
        ' Display the row in the console window.
        Console.WriteLine(output)
    Next
    Console.WriteLine()
End Sub

The example displays the following text in the console window:

Original table name: NewTable
Current Values in Table
1, Fruit, Apple, 14
2, Fruit, Orange, 27
3, Bread, Muffin, 23
4, Fish, Salmon, 12

Current Values in View
2, Fruit, Orange, 27
3, Bread, Muffin, 23

Table created from filtered DataView
2, Fruit, Orange, 27
3, Bread, Muffin, 23

New table name: FilteredTable

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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