Querying the Database (LINQ to SQL)

This group of topics describes how to develop and execute queries in LINQ to SQL projects.

In This Section

• How to: Query for Information (LINQ to SQL)
  Briefly shows how LINQ to SQL queries are basically the same as LINQ queries generally.

• How to: Retrieve Information As Read-Only (LINQ to SQL)
  Describes how to increase query performance when no change to the data is planned.

• How to: Control How Much Related Data Is Retrieved (LINQ to SQL)
  Describes how to control which related data is retrieved together with the main target.

• How to: Filter Related Data (LINQ to SQL)
  Describes how to retrieve related data by using a sub-query.

• How to: Turn Off Deferred Loading (LINQ to SQL)
  Describes how to turn off deferred loading.

• How to: Directly Execute SQL Queries (LINQ to SQL)
  Describes how to submit queries by using SQL language.

• How to: Store and Reuse Queries (LINQ to SQL)
  Describes how to compile a query one time but use it multiple times with different parameters.

• How to: Handle Composite Keys in Queries (LINQ to SQL)
  Describes how to include more than one column in a query where the operator takes only a single argument.

• How to: Retrieve Many Objects At Once (LINQ to SQL)
  Describes how to use LoadWith.

• How to: Filter at the DataContext Level (LINQ to SQL)
  Describes another use of LoadWith.

• Query Examples (LINQ to SQL)
  Provides many examples of queries.