SqlCeDataReader.IsDBNull Method

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
<SecurityCriticalAttribute> _
<SecurityTreatAsSafeAttribute> _
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)
[SecurityCriticalAttribute]
[SecurityTreatAsSafeAttribute]
public override bool IsDBNull(
    int ordinal
)
[SecurityCriticalAttribute]
[SecurityTreatAsSafeAttribute]
public:
virtual bool IsDBNull(
    int ordinal
) override
[<SecurityCriticalAttribute>]
[<SecurityTreatAsSafeAttribute>]
abstract IsDBNull : 
        ordinal:int -> bool 
[<SecurityCriticalAttribute>]
[<SecurityTreatAsSafeAttribute>]
override IsDBNull : 
        ordinal:int -> bool 
public override function IsDBNull(
    ordinal : int
) : boolean

Parameters

Return Value

Type: System.Boolean
true if the specified column value is equivalent to DBNull; otherwise, false.

Implements

IDataRecord.IsDBNull(Int32)

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.

See Also

Reference

SqlCeDataReader Class

System.Data.SqlServerCe Namespace