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DataColumn.ReadOnly Property

Gets or sets a value that indicates whether the column allows for changes as soon as a row has been added to the table.

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

'Declaration
Public Property ReadOnly As Boolean
'Usage
Dim instance As DataColumn
Dim value As Boolean

value = instance.ReadOnly

instance.ReadOnly = value
/** @property */
public boolean get_ReadOnly ()

/** @property */
public void set_ReadOnly (boolean value)

public function get ReadOnly () : boolean

public function set ReadOnly (value : boolean)

Property Value

true if the column is read only; otherwise, false. The default is false.

Exception typeCondition

ArgumentException

The property is set to false on a computed column.

The following example creates a DataColumn and sets its ReadOnly property true.

Private Sub AddColumn(ByVal table As DataTable)
    ' Add a DataColumn to the collection and set its properties.
    ' The constructor sets the ColumnName of the column.
    Dim column As DataColumn = table.Columns.Add("Total")
    column.DataType = System.Type.GetType("System.Decimal")
    column.ReadOnly = True
    column.Expression = "UnitPrice * Quantity"
    column.Unique = False
End Sub

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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