IsDBNull Method (TdParameter)

IsDBNull() is used to determine whether an OUT or INOUT parameter has a null value

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Function IsDBNull() As Boolean

'Usage
 
Dim instance As TdParameter
Dim value As Boolean
 
value = instance.IsDBNull()

public bool IsDBNull()

public:
bool IsDBNull();

Return Value

True if the value of the parameter is null, otherwise false.

Exceptions

Exception	Description
System.InvalidOperationException	The parameter is not an output parameter.

Remarks

This function should be called before calling GetValue<T> when attempting to return a type that does not support nulls. [Including String, Stream, TextReader and XmlReader]

Requirements

Target Platforms: Windows 7, Windows 8, Windows 8.1, Windows 10, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2

Reference

TdParameter Class
TdParameter Members