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DbCommand.ExecuteScalar Method

Note: This method is new in the .NET Framework version 2.0.

Executes the query and returns the first column of the first row in the result set returned by the query. All other columns and rows are ignored.

Namespace: System.Data.Common
Assembly: System.Data (in system.data.dll)

'Declaration
Public MustOverride Function ExecuteScalar As Object
'Usage
Dim instance As DbCommand
Dim returnValue As Object

returnValue = instance.ExecuteScalar
public abstract Object ExecuteScalar ()
public abstract function ExecuteScalar () : Object

Return Value

The first column of the first row in the result set.

Use the ExecuteScalar method to retrieve a single value (for example, an aggregate value) from a database. This requires less code than using the ExecuteReader method and performing the operations necessary to generate the single value using the data returned by a DbDataReader.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

.NET Compact Framework

Supported in: 2.0
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