Gets whether the control contains a null value.
Syntax
| Visual Basic (Declaration) | |
|---|
Public Overridable Function IsNull() As Boolean |
| Visual Basic (Usage) |  Copy Code |
|---|
Dim instance As SuperEditBase
Dim value As Boolean
value = instance.IsNull() |
| C# | |
|---|
public virtual bool IsNull() |
Return Value
true if the control contains the null value;
false otherwise
Remarks
Example
| C# | Copy Code |
|---|
privatevoidForm1_Load(objectsender,System.EventArgse)
{
control.AllowNull=true;
}
privatevoidcontrol_MouseDown(objectsender,System.Windows.Forms.MouseEventArgse)
{
boolbvalue;
bvalue=control.IsNull();
if(bvalue)
{
control.Value=500;
}
} |
| Visual Basic | Copy Code |
|---|
PrivateSubForm1_Load(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesMyBase.Load
control.AllowNull=True
EndSub
PrivateSubcontrol_MouseDown(ByValsenderAsObject,ByValeAsSystem.Windows.Forms.MouseEventArgs)HandlesCurrency1.MouseDown
DimbvalueAsBoolean
bvalue=control.IsNull()
IfbvalueThen
control.Text=500
EndIf
EndSub |
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
See Also
