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DbCommand.ExecuteScalar Method
Definition
- Namespace:
- System.Data.Common
- Assembly:
- System.Data.Common.dll
- Assemblies:
- netstandard.dll, System.Data.Common.dll
- Assembly:
- System.Data.dll
- Assembly:
- netstandard.dll
- Source:
- DbCommand.cs
- Source:
- DbCommand.cs
- Source:
- DbCommand.cs
- Source:
- DbCommand.cs
- Source:
- DbCommand.cs
Important
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Executes the command and returns the first column of the first row in the first returned result set. All other columns, rows and result sets are ignored.
public:
abstract System::Object ^ ExecuteScalar();public abstract object ExecuteScalar();public abstract object? ExecuteScalar();abstract member ExecuteScalar : unit -> objPublic MustOverride Function ExecuteScalar () As ObjectReturns
The first column of the first row in the first result set.
Implements
Remarks
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.
If the first column of the first row in the result set is not found, a null reference (Nothing in Visual Basic) is returned. If the value in the database is null, the query returns DBNull.Value.
Applies to
See also
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