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)

Public Property ReadOnly As Boolean

Property Value

Type: System.Boolean

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

Exception Condition

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

.NET Framework
Available since 1.1
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