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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)

public bool ReadOnly { get; set; }

Property Value

Type: System.Boolean
true if the column is read only; otherwise, false. The default is false.

ExceptionCondition
ArgumentException

The property is set to false on a computed column.

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;
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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