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.
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 Value
Type: System.Booleantrue if the column is read only; otherwise, false. The default is false.
| Exception | Condition |
|---|---|
| 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
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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.