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SqlCeDataReader.IsDBNull Method

  • Artigo

Gets a value indicating whether the column contains nonexistent or missing values.

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

Syntax

'Declaration
Public Overrides Function IsDBNull ( _
    ordinal As Integer _
) As Boolean
'Usage
Dim instance As SqlCeDataReader
Dim ordinal As Integer
Dim returnValue As Boolean

returnValue = instance.IsDBNull(ordinal)

public override bool IsDBNull (
    int ordinal
)

public:
virtual bool IsDBNull (
    int ordinal
) override

public boolean IsDBNull (
    int ordinal
)

public override function IsDBNull (
    ordinal : int
) : boolean

Not applicable.

Parameters

  • ordinal
    The zero-based column ordinal.

Return Value

true if the specified column value is equivalent to DBNull; otherwise, false.

Remarks

Call this method to check for null column values before calling the typed get methods (for example, GetByte, GetGuid, and so on) to avoid raising an error.

Platforms

Windows CE, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows XP Professional x64 Edition, Windows XP SP2

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0

.NET Compact Framework

Supported in: 2.0, 1.0

See Also

Reference

SqlCeDataReader Class
SqlCeDataReader Members
System.Data.SqlServerCe Namespace