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
- ordinal
Type: System.Int32
The zero-based column ordinal.
Return Value
Type: System.Boolean
true if the specified column value is equivalent to DBNull; otherwise, false.
Implements
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.