ColumnAttribute.IsVersion Property

 

Gets or sets whether the column type of the member is a database timestamp or version number.

Namespace:   System.Data.Linq.Mapping
Assembly:  System.Data.Linq (in System.Data.Linq.dll)

public bool IsVersion { get; set; }

Property Value

Type: System.Boolean

Default value = false.

Version numbers are incremented and timestamp columns are updated every time that the associated row is updated. (This property tells LINQ to SQL that a column should be updated to show that it is a new version; it is not meant to record information such as who made the update.)

Note the following when IsVersion is true:

  • Use DbType to specify the correct modifiers to designate a version number or timestamp column. If you do not specify DbType, LINQ to SQL infers the correct modifiers.

Version numbers are incremented and timestamp columns are updated every time that the associated row is updated. Members with IsVersion=true are synchronized immediately after the data row is updated. The new values are visible after SubmitChanges finishes.

[Column(Storage = "_VersionNum", DbType = "Int NOT NULL IDENTITY", IsVersion=true)]
public int VersionNum
{
    get
    {
        return this._VersionNum;
    }

    set
    {
        if ((this._VersionNum != value))
        {
            this._VersionNum = value;
        }
    }
}

.NET Framework
Available since 3.5
Windows Phone Silverlight
Available since 7.1
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