Designing DataTables

Visual Studio provides design-time tools for creating and editing data tables (DataTable). For an overview of what a DataTable is, see DataTables (ADO.NET).

The following topics explain how to create data tables, add them to typed datasets using the Dataset Designer, and create and edit the data columns (DataColumn) that define them.

Note

The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Visual Studio Settings.

In This Section

• How to: Create DataTables
  Provides the steps to create a new DataTable with the Dataset Designer.

• How to: Add Columns to a DataTable
  Provides the steps to create a new DataColumn in an existing DataTable.

• How to: Set the Data Type of a DataColumn
  Explains how to set or change the data type property of a DataColumn.

• How to: Change the Caption of a DataColumn
  Explains how to set the caption of a DataColumn to either the column name or something else.

• How to: Create an Autonumber DataColumn
  Provides details on setting a DataColumn to contain auto-generated numbers.

• How to: Set the Default Value of a DataColumn
  Provides details for setting the initial value for a new DataColumn.

• How to: Restrict a Data Column to Contain Unique Values
  Explains how to set a DataColumn so it cannot contain duplicate values.

• How to: Set a Data Column as the Primary Key
  Explains how to set a DataColumn to be the primary key in a DataTable.

• How to: Handle Null Values in a DataColumn
  Provides information on what a DataColumn should do when it contains a null value.

• How to: Create Data Columns that Display Expressions
  Explains how to set a DataColumn to display a calculated value.

• Walkthrough: Creating a DataTable in the Dataset Designer
  Provides step-by-step instructions for creating a DataTable and defining the DataColumns that make up its structure.

Reference

• DataSet
  Represents an in-memory cache of data.

• DataTable
  Represents one table of in-memory data.

• DataColumn
  Represents the schema of a column in a DataTable.

• DataRelation
  Represents a parent/child relationship between two DataTable objects.

Related Sections

• DataTables (ADO.NET)
  Describes how to create and customize DataTable objects.

• TableAdapters
  Provides links to topics that explain how to create and edit TableAdapters with design time tools.

• Connecting to Data in Visual Studio
  Provides links to topics that explain the different ways to connect to data in Visual Studio.

• Preparing Your Application to Receive Data
  Provides links to topics explaining what datasets are, how to create new datasets, and how to create and edit the individual objects they are made of.

• Fetching Data into Your Application
  Provides links to topics explaining how to execute queries and stored procedures, and load data into datasets.

• Displaying Data on Forms in Windows Applications
  Provides links to topics that explain how to display data on Windows Forms through databound controls.

• Editing Data in Your Application
  Provides links to topics that explain working with the data in a dataset.

• Validating Data
  Provides links to topics explaining where to put code to validate data.

• Saving Data
  Provides links to topics explaining how to send updated data from an application to the database.