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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, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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