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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
abstract IsDBNull :
ordinal:int -> bool
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
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.