ColumnAttribute.UpdateCheck Property
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Gets or sets how LINQ to SQL approaches the detection of optimistic concurrency conflicts.
Namespace: System.Data.Linq.Mapping
Assembly: System.Data.Linq (in System.Data.Linq.dll)
Syntax
'Declaration
Public Property UpdateCheck As UpdateCheck
public UpdateCheck UpdateCheck { get; set; }
Property Value
Type: System.Data.Linq.Mapping.UpdateCheck
Default = Always, unless IsVersion is true for a member.
Other values are Never and WhenChanged.
Remarks
When this property is used with one of three enums, it determines how LINQ to SQL detects concurrency conflicts.
If no member is designed as IsVersion=true, original member values are compared with the current database state.
The following enums are available:
Always Always use this column for conflict detection.
Never Never use this column for conflict detection.
WhenChanged Use this column only when the member has been changed by the application.
| Topic | Location |
|---|---|
| How to: Specify Concurrency-Conflict Checking (LINQ to SQL) | LINQ to SQL |
| Optimistic Concurrency Overview (LINQ to SQL) | LINQ to SQL |
| How to: Specify Which Members are Tested for Concurrency Conflicts (LINQ to SQL) | LINQ to SQL |
| How to: Specify Concurrency-Conflict Checking (LINQ to SQL) | LINQ to SQL |
| Optimistic Concurrency Overview (LINQ to SQL) | LINQ to SQL |
| How to: Specify Which Members are Tested for Concurrency Conflicts (LINQ to SQL) | LINQ to SQL |
Version Information
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.