Linq to sql updating
If the table object was null, the I set the Update flag to false.
The accept button will have code to direct the appropriate call like this: The Database Commands methods are located in my cs file as this is a good place to put my general code (personal preference). If there is an SQL error of some sort, the program will open a messagebox and explain the error.
At the end of the query, the output is converted to a List of the Customer Order Result type.
In this example, a typed list is created (as in the previous example) using LINQ to SQL, populated, and then the returned typed list is queried using LINQ to Objects.
In the example, an instance of the data context is created and then a query is formed to get all of the values in the table; once the query runs, the result is used as the data source of a Data Grid View control and the results are displayed in the grid: Since the Get Table function in the data context returns the entire table, this query is pretty useless but it does work and it is representative of a simple select query.
You could accomplish the same task using this code: Example 2: Select with a Where Clause The next example shows a LINQ to SQL query that incorporates a where clause.
Getting Started Provides a condensed overview of LINQ to SQL along with information about how to get started using LINQ to SQL.
Select query examples will demonstrate ordering, filtering, aggregation, returning typed lists, returning single objects and values, and how to query across entity sets (that are essentially related tables associated by foreign keys).LINQ Describes LINQ technologies for Visual Basic users. Linq Data Source Technology Overview Describes how the Linq Data Source control exposes Language-Integrated Query (LINQ) to Web developers through the ASP. If the same window will be used for the form to update a record and add a record, then the Accept button will be the single button to start the task.In this case, the query includes a where clause that only returns matches were the customer ID begins is equal to "RICAR": The preceding examples were intended to provide a simple overview as to how to conduct some basic queries against collections using LINQ to SQL and LINQ to Objects; there are certainly a great number of more complex operations that can be executed using similar procedures (groups and aggregation, joins, and so on) however the examples provided are representative of some of the more common types of queries.There is a single solution included with this download, the solution contains a Windows Forms project called "L2S_Northwind"; this project contains one form (the main form used to display the results of the demonstration queries (frm Main) , and LINQ to SQL database model (North Wind Data Classes.dbml) along with the models designer code and layout file, and a class entitled, "Accessor" that contains code used to perform the LINQ to SQL queries used in the demonstration.