Updating database table datagridview
This article provides an introduction to employing LINQ to SQL within a Windows Forms application; the article will address the incorporation of LINQ to SQL into a Windows Forms project, how to use LINQ to SQL to select, insert, update, and delete data, and how to use LINQ to SQL to execute Stored Procedures.
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).
The "select new" in the query defines the result type and then sets each of the properties in the type to a value returned by the query.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.Next up is a region containing all of the functions used to return full tables from the database through the data context.
All of the functions work essentially the same way; the data context includes a function called Get Table That next region contained in the Accessor class is Queries region; this region contains examples of different types of select queries that may be performed using LINQ to SQL.
Each function is annotated to describe what it does and what it is intended to demonstrate.