Convert.IsDBNull Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns an indication whether the specified object is of type DBNull.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function IsDBNull ( _
value As Object _
) As Boolean
public static bool IsDBNull(
Object value
)
Parameters
- value
Type: System.Object
An object.
Return Value
Type: System.Boolean
true if value is of type DBNull; otherwise, false.
Remarks
The IsDBNull method tests whether the value parameter is equal to DBNull.Value. It is equivalent to the following code:
Return DBNull.Value.Equals(value)
return DBNull.Value.Equals(value);
.gif "Note") Note: |
|---|
DBNull.Value is used to indicate a value that is missing. It is not equivalent to nulla null reference (Nothing in Visual Basic) or to String.Empty. |
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.