DataColumn.ReadOnly Property

Reference

Definition

Namespace:: System.Data

Assembly:: System.Data.Common.dll

Assembly:: System.Data.dll

Assembly:: netstandard.dll

Source:: DataColumn.cs

Source:: DataColumn.cs

Source:: DataColumn.cs

Important

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

public:
 property bool ReadOnly { bool get(); void set(bool value); };

public bool ReadOnly { get; set; }

[System.Data.DataSysDescription("DataColumnReadOnlyDescr")]
public bool ReadOnly { get; set; }

member this.ReadOnly : bool with get, set

[<System.Data.DataSysDescription("DataColumnReadOnlyDescr")>]
member this.ReadOnly : bool with get, set

Public Property ReadOnly As Boolean

Property Value

Boolean

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

Attributes: DataSysDescriptionAttribute

Exceptions

ArgumentException

The property is set to false on a computed column.

Examples

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

private void AddColumn(DataTable table)
{
    // Add a DataColumn to the collection and set its properties.
    // The constructor sets the ColumnName of the column.
    DataColumn column = table.Columns.Add("Total");
    column.DataType = System.Type.GetType("System.Decimal");
    column.ReadOnly = true;
    column.Expression = "UnitPrice * Quantity";
    column.Unique = false;
}

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

Applies to

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