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The Update method of the Data Adapter is called to resolve changes from a Data Set back to the data source.

The Update method, like the Fill method, takes as arguments an instance of a Data Set, and an optional Data Table object or Data Table name.

NET application by specifying command syntax at design time and, where possible, through the use of stored procedures.

You must explicitly set the commands before calling either by returning the auto-increment value as an output parameter of a stored procedure and mapping that to a column in a table, by returning the auto-increment value in the first row of a result set returned by a stored procedure or SQL statement, or by using the are sent to the data source is important.

For example, if a primary key value for an existing row is updated, and a new row has been added with the new primary key value as a foreign key, it is important to process the update before the insert.

You can use the USE [master] GO CREATE DATABASE [My School] GO USE [My School] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[Course]( [Course ID] [nvarchar](10) NOT NULL, [Year] [smallint] NOT NULL, [Title] [nvarchar](100) NOT NULL, [Credits] [int] NOT NULL, [Department ID] [int] NOT NULL, CONSTRAINT [PK_Course] PRIMARY KEY CLUSTERED ( [Course ID] ASC, [Year] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[Department]( [Department ID] [int] IDENTITY(1,1) NOT NULL, [Name] [nvarchar](50) NOT NULL, [Budget] [money] NOT NULL, [Start Date] [datetime] NOT NULL, [Administrator] [int] NULL, CONSTRAINT [PK_Department] PRIMARY KEY CLUSTERED ( [Department ID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N'C1045', 2012, N'Calculus', 4, 7) INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N'C1061', 2012, N'Physics', 4, 1) INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N'C2021', 2012, N'Composition', 3, 2) INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N'C2042', 2012, N'Literature', 4, 2) SET IDENTITY_INSERT [dbo].[Department] ON INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (1, N'Engineering', 350000.0000, CAST(0x0000999C00000000 AS Date Time), 2) INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (2, N'English', 120000.0000, CAST(0x0000999C00000000 AS Date Time), 6) INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (4, N'Economics', 200000.0000, CAST(0x0000999C00000000 AS Date Time), 4) INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (7, N'Mathematics', 250024.0000, CAST(0x0000999C00000000 AS Date Time), 3) SET IDENTITY_INSERT [dbo].[Department] OFF ALTER TABLE [dbo].[Course] WITH CHECK ADD CONSTRAINT [FK_Course_Department] FOREIGN KEY([Department ID]) REFERENCES [dbo].[Department] ([Department ID]) GO ALTER TABLE [dbo].[Course] CHECK CONSTRAINT [FK_Course_Department] GO using System; using System.

The Data Set instance is the Data Set that contains the changes that have been made, and the Data Table identifies the table from which to retrieve the changes.

When you call the Update method, the Data Adapter analyzes the changes that have been made and executes the appropriate command (INSERT, UPDATE, or DELETE).

For the latest documentation on Visual Studio 2017, see Save data back to the database on docs. If you modify that data, it's a good practice to save those changes back to the database.When the Data Adapter encounters a change to a Data Row, it uses the Insert Command, Update Command, or Delete Command to process the change.This allows you to maximize the performance of your ADO.However, you can also use different adapters, for example, to move data from one data source to another or to update multiple data sources.If you aren't using data binding, and are saving changes for related tables, you have to manually instantiate a variable of the auto-generated Table Adapter Manager class, and then call its Udpate All method.